PropHunt

Fix to "blowing disguises" not resetting.
Fix to arena deletion bug.

Adds safeguard to people with full inventories trying to setup an arena.

Adds completely dedicated option in the config:
dedicated: false (by default)
This setting will mean any player online will automatically join the next game without having to ./ph join.
./ph join and ./ph leave are both disabled in this mode.

Bulit against DisguiseCraft 4.8, tested on 4.8.