Similar to pixel-formats.c, but for color properties. This helper
aggregates the same color properties from different APIs into tables,
and introduce functions to use that.

The idea is that we only use that internally in our libweston struct's,
and pick the specific API value only when necessary.

Preparation for the CM&HDR protocol extension implementation.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>