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.
Generally these are very easy to understand. They use an abstract class
for common code.
I have not tested these in-game. I would like to see if I can create
some test classes but it may not be possible because of the static
BSkyBlock calls.
There's a lot more that needs to be checked in these listeners! I moved
some common methods into the abstract class because they will be used
again and again by other listeners.
Added an anvil listener.
Added the flags. They were from ASkyBlock so may have name changes.
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.
