Add shadow, outline, glow filter support for UITextField
Remove unnecessary Type::TTF Check

Remove unnecessary TTF type check on enableOutline or enableGlow function。
Update UIText.cpp
Remove misleading comment, add new comment

Remove misleading comment, add new comment for enableOutline
Merge branch 'feature/COC-5' of https://github.com/zhouxiaoxiaoxujian/cocos2d-x into ImproveUIText

Conflicts:
	cocos/ui/UIText.cpp
add text effect test
modify outline size parameter
Merge pull request #7014 from andyque/ImproveUIText

improve UIText