Allow binding lower spell ranks separately on WoW Forever - #268

Problem

On WoW Forever, the spellbook lists each spell rank as its own spell ID (e.g. three Lesser Heal entries), but click-cast bindings store and cast by name only. So /cast Lesser Heal always uses the highest rank, and every rank's cell in the Binds grid shows as bound.

Change

• GetAllPlayerSpells groups entries that share a name and tags each with its rank (C_Spell.GetSpellSubtext). Every rank below the highest gets pinRank.
• Binding a pinned rank stores pinRank on the binding, and the macro casts Name(Rank N). This covers both the single-binding and combined friendly/hostile macro paths.
• Binding the highest rank is unchanged: it casts by name, so it keeps upgrading as new ranks are learned. Existing bindings behave exactly as before.
• UI:
  • Rank badges (R1, R2…) on grid icons.
  • Rank shown in list rows, the edit panel and Active Bindings.
  • Ranks sorted lowest first.
  • Bound highlighting and duplicate detection are per rank.

Retail and flavors without ranks are unaffected: a spell only gets rank handling when several spellbook entries share its name.

Testing

Tested in game on a WoW Forever priest:

• Rank badges show on Lesser Heal and Smite.
• A Rank 2 binding shows as "Lesser Heal (Rank 2)" and highlights only the R2 cell.
• The existing unpinned Lesser Heal binding highlights only the top rank.