Change patch color coding for single-crease transition patches
Change patch color coding for single-crease transition patches

- add a small gradient to the patchColors tables so that single-crease transition patterns
  have slightly different colors

c64kernal/OpenSubdiv,anshuarya/OpenSubdiv,c64kernal/OpenSubdiv,poljere/OpenSubdiv,shengfuintel/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,poljere/OpenSubdiv,nyotis/OpenSubdiv,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv,c64kernal/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,xldeveloper/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv