This is required for automated testing (can't use static getInstance). I
really need automated testing of the protection classes, so even though
this adds a parameter to the classes, it's important to have it right
now.
Made getIslandsAt() Optional to enable better code structures in the
listeners.
Created an abstract class to simplify flag protection listeners.
Added default setting for flags that will be able to be set by config.
This default is used for any space in the worlds not occupied by an
island.
