rename VideoWidget to VideoPlayer.
update XCode project.pbxproj
Merge pull request #6644 from Dhilan007/v3_video

rename VideoWidget to VideoPlayer.
[AUTO][ci skip]: updating cocos2dx_files.json
Merge pull request #6649 from CocosRobot/update_cocosfiles_1399614149

[AUTO][ci skip]: updating cocos2dx_files.json