Adds setNormalizedPosition()

Changes in `visit()` were done in order to do it
in a robust and fast way.
Little fixes for setNormalized
Compiles on iOS
Merge pull request #6965 from Dhilan007/v3-wp8fix

Support Fast App Resume and fixed black screen may arise when using third sdk.
[AUTO][ci skip]: updating cocos2dx_files.json
[ci skip]
Merge pull request #6973 from CocosRobot/update_cocosfiles_1401873482

[AUTO][ci skip]: updating cocos2dx_files.json
Merge remote-tracking branch 'cocos2d/v3' into normalized_position

Conflicts:
	CHANGELOG
	cocos/ui/UILayout.cpp
Lua compiles and runs
Compiles on Windows and Android
ouch, more windows compile issues
Merge pull request #6947 from ricardoquesada/normalized_position

Adds setNormalizedPosition()