CoA: mirror RAID_CLASS_COLORS for the 21 custom classes

Vanilla Altoholic hardcodes a 10-entry ChatColor table keyed by the
englishClass tokens MAGE/WARRIOR/.../DEATHKNIGHT. On the CoA Voljin/PTR
realm UnitClass / GetGuildRosterInfo return tokens like BARBARIAN,
WITCHDOCTOR, CHRONOMANCER, … so the lookup falls through:

  * Altoholic:GetClassColor (Altoholic.lua:580) returns WHITE for all
    21 CoA classes via the `or WHITE` fallback — guild/character/
    profession panes lose their per-class colours.
  * DataStore_Characters._GetColoredCharacterName had no fallback at
    all — `ClassColors[englishClass] .. character.name` hard-crashed
    on nil-concat for any CoA-class character.
  * Altoholic.lua:710 read CLASS_ICON_TCOORDS[class] for the character
    portrait without a fallback; CoA classes aren't in the vanilla
    sprite sheet's coord table, so the next line `tc[1]` crashed.

Fix follows the established Exiles addon-port pattern (see
coa-omen/CoAClassColors.lua, coa-shadowedunitframes/.../CoAClassColors.lua,
coa-kui-nameplates/.../CoAClassColors.lua): mirror _G.RAID_CLASS_COLORS
into the addon's private table at load. The CoA client itself ships
the realm-authoritative 32-token palette (10 vanilla + HERO + 21 CoA)
in Interface/SharedXML/SharedConstants.lua inside patch-B.MPQ, which
populates RAID_CLASS_COLORS at FrameXML load time — see
db.exil.es /coa/dev for the full table.

- Altoholic/CoAClassColors.lua: new file, mirrors source palette into
  Altoholic.ClassInfo as "|cFFRRGGBB" ChatColor escapes. Never
  overwrites — preserves the addon's vanilla defaults and any future
  user overrides.
- Altoholic/Altoholic.xml: loads CoAClassColors.lua after Altoholic.lua
  so Altoholic.ClassInfo exists.
- Altoholic/Altoholic.lua: defensive CLASS_ICON_TCOORDS lookup with
  WARRIOR fallback (wrong icon beats crash; CoA character creation
  uses its own sprite sheet which doesn't extend the vanilla table).
- DataStore_Characters/DataStore_Characters.lua: inline mirror after
  the local ClassColors table (can't be touched from a sibling file
  because the table is file-local), plus `or WHITE` defensive fallback
  in _GetColoredCharacterName and _GetClassColor.

Does not touch DataStore_Talents — CoA's MoA system uses
C_CharacterAdvancement, not GetNumTalentTabs/GetTalentInfo, so that
module needs a full API rewrite rather than a data patch.

Altoholic-Addon/Altoholic/Altoholic.lua

@@ -707,7 +707,10 @@ function Altoholic:ShowClassIcons()
 			end)
 		
 		local _, class = DS:GetCharacterClass(character)
-		local tc = CLASS_ICON_TCOORDS[class]
+		-- CoA: CLASS_ICON_TCOORDS only carries the vanilla 10 + DK on Voljin.
+		-- For the 21 CoA custom classes the lookup is nil; fall back to
+		-- WARRIOR's coords so we render *something* rather than crashing.
+		local tc = CLASS_ICON_TCOORDS[class] or CLASS_ICON_TCOORDS["WARRIOR"]
 		local itemTexture = _G[itemName .. "IconTexture"]
 		itemTexture:SetTexture("Interface\\Glues\\CharacterCreate\\UI-CharacterCreate-Classes");
 		itemTexture:SetTexCoord(tc[1], tc[2], tc[3], tc[4]);