Sky Vaults Support (SkyBlock)

> Added commands:

/island create - Create your own island
/island tp - Teleport to your own island
/island tp <playername> - Send a teleport request to another players island
/island invite <playername> - Send an invite request to join another players island
/island accept - Accept latest invite or teleport request
/island leave - Leave the island you are currently part of
/island biome <biome> -Set the biome type of your island

> Implemented island protection against non-island members

> Prevent island reset on death or vault completion/death

> Commands can only be executed in the overworld