Prepare AppImage contents with linuxdeploy

Fix AppRun kicker script for arbitrary AppImage filenames (#37)

CI: GitHub Actions housekeeping

Fix gamepad initialization following SDL3 refactor

Load default settings when there's no prefs file (#35)

GiantLizard: Let go of grasped player before dying (#34)

Port to SDL 3

Case-sensitive FSSpec

Sync localization routines with Nanosaur 2

Fix control tags in AppStream metadata

Bump CI

Simplify LZSS.c

extract_sprites.py: Improve TGA compatibility

Check both crossbeam segments in raycast/box collision (#28)

Sink DebrisGate cbox into ground to fix spurious saucer call with sloped terrain (#28)