issue #5005, fix widget hittest problem
issue #5005, deprecated setTouchEnabled
Merge branch 'v3' into issue5005
issue #5005, fixed widget visit method
closed #5005, fix visible and enable issue
closed #5005, fix a null pointer exception
closed #5005, refactor
closed #5005, refactor
Merge branch 'v3' into issue5005

Conflicts:
	cocos/ui/UIWidget.cpp
Merge pull request #6707 from andyque/issue5005

fix widget enable issue
Matrix -> Mat4
Merge pull request #6754 from minggo/monkey-test

Matrix -> Mat4