Making AcidIsland Really Cool

[Distolfix]

Here is what you should add to your AcidIsland module:

First thing: A damage multiplier based on group. For instance, those who join should take little damage from water but a rank, possibly higher or a VIP, can take much more damage when entering the water.

Second thing: A command that can give you immunity to water damage. For example, let's say I want to build an underwater boss and a player can find a command that gives you immunity for 30 minutes.

Third thing: Add disabled-world in the config.