* Map GuiSettingsVideo and related classes
* Change isSlider/isBoolean to slider/toggle
Still very confusing without documentation, both of the values are just booleans. They indicate whether or not the option is a numeric slider value option or a boolean value option.
* 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)