clients: Add color

Add a client that creates a surface with one color using single pixel buffer.

Set to that surface an image_description created with the parametric creator of
the color management protocol.

This client can get as params:
  1. Width and height
  2. Color channels R, G, B, A
  3. The name of primaries
  4. The name of a transfer function
  5. The min, max, ref luminance levels

Signed-off-by: Joan Torres <joan.torres@suse.com>