adding DistanceZoneSet singleton class
adding methods to check and set if distance zones are enabled
adding DistanceZoneBuilder and implementation
adding DistanceZoneUtil
improving null checks
adding a method to reload DistanceZones
removing a test class
marking a method as deprecated
adding option to creatureSpawning.yml
adding a boolean toggle for union or intersect
static method
returning a copy
adding a method that gets the tier for the event