add cocos2d.h into pre-compiled header
remove unneeded codes
remove unneeded include header files
fix conflict
update release note
Merge pull request #7889 from minggo/update-release-note

[ci skip]update release note
[ci skip]
fix compiling error on windows
Merge pull request #7890 from minggo/compiling-optimize

Compiling optimize
Adds ClippingNode bug test case
Merge pull request #7894 from ricardoquesada/render_texture_fix

Adds ClippingNode bug test case