Adds CoAClassColors.lua which merges 22 entries (HERO + 21 custom) into _G.RAID_CLASS_COLORS at file-load time, before Omen.lua takes its local snapshot. Vanilla 10 are left untouched. !ClassColors is also folded in if loaded.
Fixes: Omen bars rendering generic dbBar.BarColor for all CoA classes because Omen.lua:1629 looks up RAID_CLASS_COLORS[class] keyed on the file_string returned by UnitClass(), and PROPHET / MONK / FLESHWARDEN / etc. don't exist in stock Blizzard tables.
florian.berthold