MultiSpawn

• Fix teleport on death respawn not working (#5, thanks @Laiao)
• Add configuration options to disable death / join respawn (#6)
• Add new permission -- multispawn.noteleportondeath. If the player has this, we won't send them to spawn on death (#6)
• Change default multispawn.noteleport to false -- having it set to default OPs was confusing people

Tested with 1.16.5, should work for almost anything.