fixed no effect with stopping tween between two frames
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
change tab to 4 space
change tab to 4 space
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/2youyouo2/cocos2d-x into v3

Conflicts:
	external
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into mesh3d
Merge pull request #16 from cocos2d/v3

update cocos2d-x
Merge branch 'mesh3d' of https://github.com/super626/cocos2d-x into mesh3d
modify vec2
Merge pull request #17 from chuanweizhang2013/v3luaruntime

modify vec2
Merge pull request #6789 from cocoscodeide/v3

update template project vect
Updates download-deps.py for execute this python where not in the root of cocos2d-x.
Merge pull request #6790 from dumganhar/download-fix

Updates download-deps.py for execute this python where not in the root of cocos2d-x.
Merge pull request #6734 from 2youyouo2/v3

fixed no effect with stopping tween between two frames