Difficult Raids [FORGE]

- Added Ashenmancer (most attacks are in, one's still WIP, one subject to incremental changes)
- Ashenmancer & Necromancer minions' armor is now fully customizable through (a lot) of tags
- Necromancer minions now return to the Necromancer if they're far enough away
- Updated /difficultraids_nextwave command to actually kill illagers instead of dealing their health as damage
- Updates to Necromancer/Ashenmancer/Voldon minions:
  - Fixed timeout logic during deserialization
  - Fixed minions losing custom targeting when loaded
  - Minions now target villagers at a lower priority than players, guards and iron golems