Begin adding support for Cocos2d v3.

Change references to ccTime to CCTime & make backwards compatible. Change
references to CCTexture2D to CCTexture & make backwards compatible for
cocos2d v1/v2. Change references to CCNode isRunning to isRunningInActiveScene
and make backwards compatible. Change references to CCDirector winSizeInPixels
to viewSizeInPixels and make backwards compatible. Replace CCLayer with CCNode
under Cocos2D v3. Import private Cocos2D header files into CC3CC2Extensions.h.
Support both NSArray & CCArray in CC3CC2Extensions.m. Add Chipmunk code and
target to demo apps and workspace. Build Chipmunk as non-ARC target. Change
install-cocos3d.sh installation script to include Cocos2D v3 code directories.
Move common demo projects Controls code to Common project resource area.
Remove extra Chipmunk target files.
Improve CC3OpenGL sharedGL access performance.

Add CC3OpenGL isRenderThread & remove NSThread isRenderingThread to improve
performance of sharedGL singleton under ARC.