Qt update 2

Updated Qt5 port:
* fixed build;
* much improved support for desktop Linux (OpenGL, mouse/keyboard input, unresizable window, IME);
* modified doxygen.config to enable QtCreator help build;
* added qt5 project to template.

Forum topic: http://www.cocos2d-x.org/forums/6/topics/33997
Unfortunately, no items from TODO list in this topic are done.