Core Lua scripts of LuaSTG-x.
app: defines what will be loaded when the engine starts.audio: helpers for audio engine.cc: helpers for cocos things.cocos,packages.mvc: provided by cocos.core: provide core APIs. Should not loaded by the user.core_x: provide support for other modules. Should not loaded by the user.game: helpers and experimental codes for games.i18n: i18n module.imgui: imgui helpers.l2d: live2d helpers.math: math extension.platform: platform dependent codes.plus: ported from LuaSTGPlus.shader: default shaders.util: utilities.