refactor: replace lovr with LuaCATS submodule

.gitmodules

meta/3rd/lovr

meta/3rd/lovr/config.json

meta/3rd/lovr/library/callback.lua

meta/3rd/lovr/library/lovr.lua

meta/3rd/lovr/library/lovr/audio.lua

meta/3rd/lovr/library/lovr/data.lua

meta/3rd/lovr/library/lovr/event.lua

meta/3rd/lovr/library/lovr/filesystem.lua

meta/3rd/lovr/library/lovr/graphics.lua

meta/3rd/lovr/library/lovr/headset.lua

meta/3rd/lovr/library/lovr/math.lua

meta/3rd/lovr/library/lovr/physics.lua

meta/3rd/lovr/library/lovr/system.lua

meta/3rd/lovr/library/lovr/thread.lua

meta/3rd/lovr/library/lovr/timer.lua