add some functions
completed showing max score
modify
merge
* 更新版本计划
Merge branch 'master' of https://github.com/zpublic/AV-GSG
* 更新版本计划
completed displaying max score
Merge pull request #20 from vnoc-YeZi/master

又弄好了"显示最高分数"
Merge branch 'master' of https://github.com/zpublic/AV-GSG into Sum

Conflicts:
	AV-CSG/scene/GameScene_Play.cpp