Rite of Returning 1.0.69

Lich form update:
- Added uploaded Lich.bbmodel as assets/riteofreturning/models/entity/lich.bbmodel.
- Extracted embedded texture to textures/entity/lich_skin.png.
- Added custom client renderer for player lich form.
- Lich form cancels normal player rendering so armor and held items are not visible.
- First-person hand/item rendering is canceled while in lich form.
- Added network sync for lich form visual state.
- Added /ror form set lich.
- Animation mapping:
  Idle = Idle
  Sit = Sitting/riding a mob
  Slow Move = Walking
  Fast Move = Sprinting
  Right Move = Strafe Right
  Left Move = Strafe Left
  Back Move = Walk Backwards
  Crouch = Crouching
  Crouch Walk = Crouch walking
  Attack1/Attack2 = Melee attacks
  Shoot/Cast = projectile/casting magic
