This is a larger big fix release, with a few changes under the hood, and a few new features to boot.

I also want to thank a first time contributor Barnus30 for some work he did for this release.

Features:
- Configurable item slots for lobby, spectator, and game items (Barnus30)

Fixes:
- Block placements are now canceled for players in game (Barnus30)
- Fixed player role overlap and memory leaks (Barnus30)
- Improved support concurrent server threads which also improves plugin stability
- Updated dependencies
- Fixed an issue where players were teleported into a world before it was loaded, crashing the server
- Fixed an issue with loading bukkit materials, causing errors during tab completion
- Cached minecraft materials, items, and effects for improved speed
- Properly reset team list on game reset
- Inventories and scoreboards are now also saved for spectators
- Removed non required libraries from the jar to make it smaller (slightly)