A dyed sign's color will now take priority over its main sign color. Black is used as the "default" color, so use black dye to remove dye effects
Adds a new class to keep track of a sign and its colors
Updates a bunch of code to make everything account for the dye color
Removes the enableBungee check in the BungeeCordListener as it should only be listening if the option is enabled anyway
Improves the checking for players teleporting from the end
Adds a proper permission check to make sure players are allowed to teleport through the artificial portal
Adds a teleportation back to the entrance as the teleportation event cannot be properly cancelled
Adds a proper class for storing info about the teleportation
Adds all chunk unloading to a queue
Adds a thread which unloads chunks
Updates chunk unload requests such that a chunk won't be unloaded twice,
and an old unloading request cannot unload a chunk too soon
