the SDL packages. From ChangeLog:
Engine changes
--------------
* Upgrade to SDL 2 (#262). Thanks Vlag.
* Accelerate video operations in GPU if available. Expect huge speedups.
* Add the hq2x, hq3 and hq4x pixel filter algorithms as new video modes.
* Make the window resizable (#338).
* Use LuaJIT if available instead of vanilla Lua for better performance.
* New map entity type: custom entities, fully scripted (#323).
* Conveyor belts are now called streams and can be non-blocking (#288).
* Collision rules of streams (conveyor belts) are now like holes.
* Rewrite the main loop with a constant timestep (#351).
* Show a dialog box in case of fatal error.
* The "wide" video modes do not exist anymore. SDL2 does the job now.
* Fix enemy:on_hurt() that was wrongly called when immobilized.
* Fix life and money exceeding the max when the max changes (#355).
* Make stairs sounds optional (#364).
* Make more checks in sprite files to avoid crashes (#357).
* Fix RandomMovement speed that was not taken into account (#361).
* Set the default speed of StraightMovement to 32 instead of 0 (#343).
* The size of all map entities must be a multiple of 8 (#358).
* Thrown entities (pots, bombs...) can now fall to a lower layer (#349).
* Running into a crystal or a solid switch now activates it (#193).
* The hero can now jump over distant crystal blocks (#42).
* The shield no longer protects while using the sword or carrying (#192).
* Fix collisions detected on disabled entities (#455).
* Fix pixel collisions coordinates when sprites move (#372).
* Fix a slowness when loading maps (#374).
* Fix crash when accessing a map not active anymore (#371).
* Fix crash when changing the movement of the hero (#392).
* Fix crash when calling hero:start_treasure() with wrong parameters (#391).
* Fix crash when calling game:has/get/set_ability() with wrong name (#408).
* Fix a crash when creating two entities with the same name (#370).
* Fix issues with unobtainable treasures.
* Fix the starting location wrongly saved with special destinations (#375).
* Fix map:set_tileset() sometimes moving the hero near the map border (#400).
* Fix enemies stuck on blocks (#360).
* Fix enemies stuck on crystal blocks (#41).
* Fix human NPCs not automatically showing "walking" when moving (#336).
* Fix the hero leaving the grabbing state even while the game is suspended.
* Fix low walls in dynamic tiles behaving like normal walls.
* Fix wrong collisions of right-up and left-down diagonal jumpers.
* Fix jumpers that could be traversed sideways (#481).
* Fix blocks no longer stopping when aligned on the grid since Solarus 0.9.3.
* Fix entities not always shown when they have no optimization distance.
* Call hero:on_removed() and stop hero timers when stopping the game (#421).
* Don't die if the map or destination saved no longer exists (#301).
* Don't die if a map has no destination. Show an error and go to 0,0 instead.
* Don't die if hero:teleport() attempts to go to a non-existing place.
* Don't die if attempting to start a game without map.
* Don't die if attempting to start a non-existing dialog.
Data files format changes
-------------------------
You can use the script tools/data_files_conversion/1.1_to_1.2/update_quest.lua
to automatically update your data files.
Don't forget to make a backup first.
* Languages: New syntax of strings.dat easier to read and parse (#170).
* Maps: The world property is now optional (#128).
* Maps: Destructibles no longer have subtypes, they are customizable (#270).
* Maps: Rename entity shop_item to shop_treasure.
* Maps: Rename entity conveyor_belt to stream with new features (#288).
* Maps: Teletransporters transition property is now a string (#402).
* Maps: Walls have a new property "stops_projectiles".
* Sounds: Running into a wall now plays a sound other than "explosion" (#297).
Lua API changes
---------------
Changes that introduce incompatibilities:
* Video mode names have changed: no more wide, fullscreen ou windowed names.
* sol.video.switch_mode() no longer changes the fullscreen flag.
* surface:set_transparency_color() no longer exists. Use surface:clear().
* sol.audio.play_music("none") is replaced by sol.audio.play_music(nil).
* on_key_pressed() and on_character_pressed() are now both called (#344).
* Destructible objects no longer show hardcoded dialogs (#270).
* map:create_destructible() has no hardcoded subtypes anymore (#270).
* map:create_teletransporter(): the transition is now a string (#402).
* map:create_shop_item() is replaced by map:create_shop_treasure().
* map:create_conveyor_belt() is replaced by map:create_stream() (#288).
* The state "conveyor belt" no longer exists in hero:get_state() (#288).
* The built-in strength of the sword has changed (#426).
* Bosses are not initially disabled anymore (#448).
* Call enemy:on_hurt() before enemy:on_dying() (#325).
* enemy:on_hurt() no longer takes a life_lost parameter (#426).
* The built-in defense of the tunic has changed (#428).
* enemy:get/set_magic_damage() no longer exists (#428).
* hero:start_hurt() no longer takes a magic parameter (#428).
* hero:start_hurt() now hurts the hero even when enemies cannot.
* Enemies have now a default size of 16x16 and origin of 8,13 (#354).
* The size of enemies must be a multiple of 8 (#358).
* item:on_pickable_movement_changed replaced by pickable:on_movement_changed.
* pickable:get_treasure() now returns the item instead of the item's name.
* Timers: returning true in the callback now repeats the timer (#152).
* sol.timer.start() now always returns the timer, even if its delay is zero.
Changes that do not introduce incompatibilities:
* New Lua type and methods for custom map entities.
* New API of destructible objects, fully customizable now (#270).
* Colors now take an optional alpha value as fourth component.
* New functions sol.video.get/set/reset_window_size().
* New method surface:clear().
* Add loop and callback features to sol.audio.play_music() (#280).
* New function sol.main.get_metatable(), allows to implement shared behaviors.
* The lifetime of a menu can now be another menu.
* New method menu:is_started().
* Attempt to stop a menu already stopped is no longer an error.
* New method map:get_hero() (#362).
* map:get_world() can now return nil because the world is now optional (#128).
* map:create_wall() accepts a new property "stops_projectiles".
* Entity names are now auto-incremented to simplify their creation.
* New method entity:get_game() (#363).
* New methods entity:bring_to_front() and entity:bring_to_back() (#273).
* entity:test_obstacles() now takes an optional layer parameter.
* New methods enemy:get_attack_consequence(), get_attack_consequence_sprite().
* The event entity:on_created() is now called for all types of entities.
* New event enemy:on_hurt_by_sword() to customize the sword strength (#426).
* New event enemy:on_attacking_hero() to customize attacks (#356).
* New event enemy:on_hurting_hero() to customize hurting the hero (#428).
* New event hero:on_hurt() to customize the defense of the equipment (#428).
* hero:start_hurt() now takes an optional entity and sprite (#417).
* New methods hero:is/set_invincible() and hero:is/set_blinking() (#418).
* New methods hero:get/set_animation() to set custom animations (#155).
* New methods hero:get/set_sword_sound_id() to change the sword sound (#155).
* New methods to set custom tunic, sword and shield sprites (#155).
* New event sensor:on_left() (#339).
* New event block:on_moving() (#334).
* New functions to get/set the properties of teletransporters (#403).
* New functions to get/set the properties of blocks.
* New methods to simulate game commands, by mrunderhill (#382).
* New event sensor:on_left() (#339).
* New event block:on_moving() (#334).
* New event teletransporter:on_activated() (#312).
* New event destination:on_activated() (#312).
* movement:on_position_changed() now takes x and y parameters (#342).
* Fix movement:start() raising an error if the optional callback is nil.
* Fix random_movement:get_max_radius() that was not working.
* Check the parameter sign in game:add/remove life/money/magic (#416).
* Check the parameter sign in item:add/remove_amount.
* Fix timer:is_suspended_with_map() that was not working.
* Fix crash when calling timer:set_suspended_with_map() without game started.
* New methods timer:get/set_remaining_time.
* New function sol.main.get_elapsed_time() to get the simulated time (#424).
* New function sol.input.get_key_modifiers() to get the key modifiers state.
Solarus Quest Editor changes
----------------------------
* The editor is now built with Maven (#365).
* Multiple entities can now be resized at the same time (#405).
* Copy-pasting entities now pastes them at the cursor (#404).
* The map view can now be dragged using the middle mouse button (#413).
* Zoom in/out in the map view using the middle mouse wheel (rekcah1986).
* Add buttons to edit or refresh the tileset from the map view (#425).
* The tileset view can now be dragged using the middle mouse button (#427).
* Selecting a tile now highlights its pattern in the tileset view (#290).
* Ctrl/Shift+click even on an entity now starts a selection rectangle (#410).
* Tile patterns can now be moved in the tileset editor (#422).
* The id and name of a new resource and now asked in a single dialog (#321).
* Show the old value in the dialog to change an id/name (#468) (rekcah1986).
* The order of resources in the quest tree can now be changed (#319).
* Increase the stepsize when scrolling the map view.
* Center the dialog of editing an entity (#443).
* Add a scroller to dialogs that are too high (#437) (rekcah1986).
* Show the map or tileset name in the "do you want to save" dialog.
* Show quest name and resource ids in the tree view (thanks rekcah1986).
* Don't place new tiles below other entities if there are some (#461).
* Fix hidden entities getting selected when clicked (#460).
* Fix selecting entities losing their order when changing the layer.
* Fix NullPointerException when canceling the Open Project dialog.
* Fix freeze if tiles don't exist when changing the tileset of a map.
* Fix the tree not refreshing when deleting a resource (#335).
* Fix the tileset editor not always showing the save dialog on closing.
* Fix the num_columns property of sprites wrongly parsed.
* Fix wrong displaying of right-up and left-down diagonal jumpers.
* Switches, crystals and crystal blocks now show their actual sprite (#376).
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