in vertex_buffer. Improved vertex program pipeline stage such that
output registers can be processed in a loop. Getting closer to where
we need to be in order to implement performance optimizations...
normal, texcoords, fogcoord, secondary color, etc) to GLfloat[4] datatype.
Aliasing of glVertex, glNormal, glColor, glFogCoord, etc. to glVertexAttrib
now complete.
Moved vertex program hash table into shared context state.
Implemented reference counting for vertex programs.
Replaced tnl "ProjectedClip" with "Ndc" (normalized device coordinates).
