Morph

+ Added option to require players to kill mobs multiple times before gaining the morph
+ Added option to completely disable the GUI
+ Moved mob config to separate file
+ Added option to disable certain morphs
+ Added option to adjust health for each morph
+ Added /morph info mob to show what abilities each morph has
* Fixed GUI opening in disabled worlds
* Fixed missing lang property
* Made morphs enabled in all worlds by default
* Fixed a bug where opped players wouldn't have fly disabled when they unmorph
* Fixed mob noises having too high of a pitch