Initial work on glimp and qgl
Made GL_TEXTURE_MAX_LEVEL setting a feature check (it's avaliable in OpenGL 1.2 and higher and OpenGL ES 3.0 and higher [unless GL_APPLE_texture_max_level exists])
Added ability to set EGL "driver"
Additional trimming of pre-OpenGL ES 2.0 supported code until it can be reimplemented later
Skeleton functions for input support
Forgot to implement Sys_GetProcessorId and Sys_GetProcessorString