Change log

- Added Nearby Player Visibility, players can no longer see nearby players in the same world but in different dungeon instances
- Added more information to Info Commands
- Added PlayerManager to handle offline player's data
- Added and changed some debug messages
- Added corresponding messages for invalid page input in Info Commands
- Changed colors of Info Commands to better reading
- Fixed holograms and particles not applying to Buffs and Teleporters
- Fixed buff locations are wrongly calculated if multiple dungeon instances are running
- Fixed dungeon not ending properly when plugin reloads
- Fixed players are not getting teleported if they disconnect in dungeon and login after dungeon ends
- Fixed spectate dummy not removed if the player disconnects when the dungeon is pre-starting
- Internal code structure changes