Updated the migrations to indicate progress (Potential to base progress for the "processing" sections on the file size of the legacy database)
Updated the JobRunner to properly support concurrent queues for sending/receiving (other queues are still serial)
Added the typing indicator logic into the ConversationVC
Put code into SUKLegacy for connecting to the YDB database
Fixed a couple of minor UI bugs with the GalleryRailView
Updated the media gallery selection screen to use the appropriate system theme colouring (was painful to randomly swap from dark mode to like for one screen...)
Added an alert for when the database migration fails
Deleted the legacy migrations (manually applying any unapplied changes as part of the YDB to GRDB migration process)
Updated the config message generation for GRDB
Migrated more preferences into GRDB
Added paging to the MediaTileViewController and sorted out the various animations/transitions
Fixed an issue where the 'recipientState' for the 'baseQuery' on the ConversationCell.ViewModel wasn't grouping correctly
Fixed an issue where the MediaZoomAnimationController could fail if the contextual info wasn't available
Fixed an issue where the MediaZoomAnimationController bounce looked odd when returning to the detail screen from the tile screen
Fixed an issue where the MediaZoomAnimationController didn't work for videos
Fixed a bug where the YDB to GRDB migration wasn't properly handling video files
Fixed a number of minor UI bugs with the GalleryRailView
Deleted a bunch of legacy code
