NeHeGL - SDL port

TODO List:
----------

Win32:

- Process all events unhandled by SDL by using SDL_SetEventFilter() and
SDL_SysWMEvent
- Toggle Fullscreen

Linux:

- Implement the ASK_FULLSCREEN MessageBox

All:

- Include Date/Time in logging
- Setup a fancy icon using SDL_SetIcon()
- Extend texting to all platforms where OpenGL/SDL coexist (Solaris/BeOS/Mac/ecc)
- Show performance differences between the SDL_OPENGLBLIT mode and the glOrtho()
technique.

SnowDruid '01