Merge of GL-AutoChoose. This branch is the final step of fully supporting both OpenGL and OpenGL ES in the same binary. This of course only applies to EGL and won't work for GLX/AGL/WGL since they don't really support GL ES. The changes here actually aren't too terrible, basically change every #ifdef USE_GLES to a runtime check. This adds a DetectMode() function to the EGL context backend. EGL will iterate through each of the configs and check for GL, GLES3_KHR, and GLES2 bits After that it'll change the mode from _DETECT to whichever one is the best supported. After that point we'll just create a context with the mode that was detected