the D3D11 tweaks:
- better error message formatting
- D3DDDIERR_DEVICEREMOVED from Present is a fatal error too
- synchronized offsets is always the automatic behavior for now
it turns out that split mode isn't always the fastest for nVidia
this is because it would draw (parts of) geometric edges with different colors and that makes visual inspections annoying
also, final MSAA sample counts are always reported by GL3 and GL2 now
added con_drawHelp and con_col*
letting the mod know we support the "cap_ExtraColorCodes" extension
con_colText overrides ^7 in the console and the help panel
extended console back scroll arrows all the way
renamed and documented the core GLimp functions
moved the memset calls out of GLimp_Shutdown
dealing with anisotropic filtering properly and fixed the cvar's range and help
platform extension loading is done through Sys_GL_LoadExtensions
throwing fatal errors is done by the renderer exclusively
removed QGL_Init and QGL_Shutdown
cleaned up glconfig_t
filling up the unused glConfig fields in the renderer for old mods
