v0.4.7

Update copyright. (+0.1.0)
Optimize Json ParseNumber and code format. (+0.0.1)
Json optimize if else to switch case. (+0.0.1)
Refactor Json ParseObject, ParseArray and SkipString fucntions. (+0.1.0)
Rename TweenData to Tween. (+0.1.0)
Fix tween variable name error and float value missing 'f'. (+0.0.2)
Fix code warning and modify log msg. (+0.0.2)
Add LibPng 1.6.25 XCode and AndroidStudio project. (+0.1.0)
Modify java and swift code. (+0.0.1)