replace CC_SAFE_RELEASE to CC_SAFE_RELEASE_NULL
Merge pull request #4911 from chengstory/fixesBugs_Develop

Fixes bugs on cocos2dx 3.x
fix crash in UnitTest.cpp on vs.
Merge pull request #4915 from Dhilan007/develop_crash

fix crash in UnitTest.cpp on vs.
Merge branch 'develop' into develop_nutty_modify_framework_fixedmemleak