Created a nice utility library for doing animations, and used it in the ritual crafting UI.

meson.build

@@ -79,6 +79,8 @@ dependencies += [
 sources = [
   'ai.cpp',
   'ai_debug.cpp',
+  'animation.cpp',
+  'animation.cpp',
   'autowalker.cpp',
   'boss_fight_ui.cpp',
   'camera.cpp',
@@ -138,6 +140,7 @@ executable('runtests', sources + [
   'tests/rituals.cpp',
   'tests/sound.cpp',
   'tests/spatialmap.cpp',
+  'tests/animation.cpp',
   'tests/stats.cpp',
   'tests/textures.cpp',
   'tests/tilemap.cpp',