BetterGear

### Fixed
- Armor type is now matched to the player's class. Recommendations were based on
  item level alone, so a paladin could be told to equip a higher item level leather
  piece. The game allows it, but the armor specialization bonus would be lost.
  Only the class's own armor type is suggested now:
    plate   - Warrior, Paladin, Death Knight
    mail    - Hunter, Shaman, Evoker
    leather - Rogue, Druid, Monk, Demon Hunter
    cloth   - Mage, Warlock, Priest
- Applies to the nine armor slots only (head, shoulder, chest/robe, waist, legs,
  feet, wrist, hands). Cloaks (cloth for every class), necks, rings and trinkets
  carry no armor type and are never filtered out.
- Weapons are unaffected: they were already limited to the subclass already equipped.
- Fails open: an unknown class token or armor subclass never hides a real upgrade.
- Rejected items report "type d'armure inadapté à la classe" in /higherilevel debug.