This approach simulates an enum, but one that can be extended by others
to add custom flags. I added a handy values() method that uses
reflection to provide a list of all the flags in the class.
See TestBSkyBlock.java test classes for the tests of the default flag
registration and the custom flag registration.
Added the adapter annotation to MySQL and fixed issues with empty
hashmaps causing null errors.
Added a flag serializer adapter for the protection flags so that flags
are saved and loaded correctly.
Renamed the Adapter notation class to be clearer about what it is doing.
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.
