Closed #1757: iOS OpenGL renderer
* Optimize rendering speed and CPU usage by avoiding buffer copy from frame's buffer
* Add various video dev capabilities



git-svn-id: http://svn.pjsip.org/repos/pjproject@4821 74dad513-b988-da41-8d7b-12977e46ad98
Misc (re #1751): Fixed compile error 'Implicit declaration of function is invalid in C99' on Xcode 5.1.1.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4822 74dad513-b988-da41-8d7b-12977e46ad98
Misc (re #1751): Set media transport state back to NULL after media transport creation fails, and also remember the error code.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4823 74dad513-b988-da41-8d7b-12977e46ad98