optimized performance
objLoader.loadAndInitObjFile: add removeResource arg
stage bgColor
add tags to GameObject
增加事件之间传递性
add Component.prototype.applyProperties
不要传递性
indexInParent & getChildIndex
add child to GameObjectEvent
add draw3in1
add query & fixes indexInParent
loadObjFiles  loadAndInitObjFiles
build
loadAndInitObjFileToObjs
removeAllListeners
build
fixes bug
fixes: id
applyIf
optimized AsyncImage.draw