Updates

-Fix issue causing all video cards to be detected as AMD graphics cards
-Removed texture intensity and lightmap modulation sliders
-Removed environment mapped shells from video menu
-Removed r_ext_texturecompression
-Removed r_arb_vertex_buffer_object
-Removed r_ext_swapinterval
-Removed r_motionblur
-Removed r_saturatelighting
-Removed r_lightmaptype
-s_primary now defaults to 1 (was 0)
-r_trans_lighting now defaults to 1 (was 2)
-r_rgbscale now defaults to 1 (was 2)
-Only load OVR shaders when enabled
-Better error detection during initialization
-Verbage tweaks