* Nothing overly interesting.
* Map workers and fix the thread factory variable name.
* Map WorldInfo and some other things I found along the way.
* Fix some mappings, map Enchantments class.
* Boss bar mappings
* Tons of GUI related mappings + reorganization
* Move GUI classes out of gui.screen
* Move classes out of old hud.impl package
* Reorganize GUI packages (number 2)