fix: copy map when getParseCallBackMap() and getParseObjectMap()
add GUIReader::registerTypeAndCallBack for std::function
replace NULL to nullptr

fix compile error
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
fix indent
remove resources for unused.
Merge branch 'customguireader' of https://github.com/lite3/cocos2d-x into customguireader
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
add CustomGUIReader for lua
skip GUIReader::registerTypeAndCallBack for lua bindings
fix ccs.CustomGUIReader not in ccs table
fix
fix compile error on android
fix compile error on Xcode
Merge pull request #7744 from lite3/customguireader

GUIReader::registerTypeAndCallBack for std::function and add CustomGUIReader for lua