rearranged r_speeds report a bit, and split up reporting of meshtris into normal...

rearranged r_speeds report a bit, and split up reporting of meshtris into normal and transparent categories, also displays number of meshs of each type
made byte color array format work (byte format is very slightly faster than float)
disabled float color array format to save some memory
added gl_mesh_sorttransbymesh cvar (default: on) to get a performance gain in mingled mesh conditions (by never mingling triangles of different meshs), this mode can batch render transparent triangles too (unlike the other two modes)
increased default maxtriangles to 8192

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@1484 d7cf8633-e32d-0410-b094-e92efae38249