Moves code for keeping track of players to DropperArenaPlayerRegistry
Adds a DropperArenaRecordsRegistry for keeping track of records
Stores playing players as DropperArenaSession to be able to store more metadata
Adds an enum for different arena game-modes
Adds a record result enum for defining which kind of record a player achieved (personal or global)
Adds a helper-class for teleporting a player to and from arenas
Adds storage of currently playing players to DropperArenaHandler
Adds methods for getting, adding and removing arenas to DropperArenaHandler
Adds more annotations in some places
Adds commands and permissions to plugin.yml
Uses the Spigot API instead of the Paper API
Reduces the Java version to 16, just in case.
Adds a lot of empty classes to show the intended plugin structure.
