Cleanup and stats loading fix for YAMLDataSource
Updated YAMLDataSourceTest for stats.
Fixed some spacing, optimized imports.
Support yaw and pitch for LLocation
Merge branch 'experimental' of github.com:Legends-Dev/Legends-Core into experimental
Reorganized some methods in YAMLDataSource
LPlayerHandler now sets the name of the LPlayer.
Partially implemented player data saving.
LPlayer now tracks previous primary or secondary class levels.
Implemented saving of previous primary and secondary classes
Optimized imports
Implemented some more convenience methods in YAMLHelper
Implemented loading of player data.
Updated tests for YAMLDataSource
Refactoring in preparation for exp sources implementation.
Updated imports
Added a getDoubleMap convenience method to YAMLHelper
Implemented experience groups
Methods for adding ExpGroups to LClass instances.
Override equals and hashcode for ExpGroup