refactor: replace love2d with LuaCATS submodule

.gitmodules

meta/3rd/love2d

meta/3rd/love2d/config.json

meta/3rd/love2d/library/love.lua

meta/3rd/love2d/library/love/audio.lua

meta/3rd/love2d/library/love/data.lua

meta/3rd/love2d/library/love/event.lua

meta/3rd/love2d/library/love/filesystem.lua

meta/3rd/love2d/library/love/font.lua

meta/3rd/love2d/library/love/graphics.lua

meta/3rd/love2d/library/love/image.lua

meta/3rd/love2d/library/love/joystick.lua

meta/3rd/love2d/library/love/keyboard.lua

meta/3rd/love2d/library/love/math.lua

meta/3rd/love2d/library/love/mouse.lua

meta/3rd/love2d/library/love/physics.lua

meta/3rd/love2d/library/love/sound.lua

meta/3rd/love2d/library/love/system.lua

meta/3rd/love2d/library/love/thread.lua

meta/3rd/love2d/library/love/timer.lua