Pet/spell bug fixes

[Fluglow]

• Fix all spells benefitting from weapon damage talents
• Fix hunter pets matching owner level on login
• Fix hunter pets being lootable/rewarding experience
• Fix hunter pets using scripted spells
• Add handling for pet death
  • Fixes dead pet preventing resummoning
  • Fixes dead pet reviving on login
  • Fixes Summon Pet cooldown unlock behavior
• Fix Crippling Poison crash
• Use Optional in typing to retain Python 3.9 compatibility