ABANDONED: Abandon trying OpenGL + wxWidgets

OpenGL + wxWidgets doesn't work on Mac OS X, if you're trying to
use OpenGL 3.x/4.x.

The thing is, if you want OpenGL 3.x/4.x core profile, you need to
create the OpenGL context by using Cocoa APIs, which should be written
by objective-C.

Now the wxWidgets wxGLCanvas/wxGLContext uses Carboon APIs(aglCreateContext)
which doesn't support choosing high version OpenGL, also the "agl"
apis have been deprecated on OS X 10.9.

There are some articles describing creating OpenGL 3.x/4.x context
based on current wxWidgets implementation:

https://www.opengl.org/discussion_boards/showthread.php/165410-My-first-openGL-3-0-program
http://www.lighthouse3d.com/2012/07/working-with-core-opengl-in-wx-wigets/

But they are focusing on windows, using "wgl" APIs.

Signed-off-by: Mark Zhang <super119@139.com>