Player power is now internally an integer. There is no good reason to use floating point math there. Stored as an uint16 in replays.
Player coordinates are now floored when a stage starts. This is unnoticable to the player. Stored as a pair of uint16s in replays.
See previous commit as for why. Note that this slightly changes the processing order, unlike the previous change, so any replays recorded prior to this commit will desync. The new behaviour, however, should be slightly more correct.
added two config options:
disable_shader: will turn off the use of shaders and fbos in the game. there is no full replacement for them, however.
disable_audio: guess what.
both options *should* be activated automatically as soon as something goes wrong.
added some kind of reference system (see list.h) to ensure particles/projectiles/enemies storing pointers to each other that they will not access a borked address.
