[cairo] Rendering Intent names

[James Cloos]

I recently saw some interesting UI names for the four icc rendering
intents; they look like they may be useful for cairo's api and docs.

They were:

     Match              for  absolute
     Proof              for  relative
     Picture or Photo   for  perceptual
     Business or Vivid  for  saturation

They may prove easier for users to understand and remember than the
names used by, eg, the PDF reference.

-JimC
-- 
James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6