Minor changes
Add beginnings of a TARDIS Destination Terminal
Make the terminal step choosable from 4 options

The steps are 10*step, 25*step, 50*step, 100*step - where `step` =
getConfig().getInt("terminal_step") - which defaults to 1
Set the destination via the Terminal
Only switch texture packs when entering by the backdoor if preference is set
Make the EP1 NPC look at players, and set its yaw if the spawn location has been changed
Make sure we respect permissions and other plugins

Properly get the highest block Y in Nether
Add ARS - `/tardis update ars`, allow comparators to be a console button
Fix grammar/logic in gravity command message
Change the ARS message when TARDIS is travelling
Delete the world from the MultiWorld config
Update TODOs
Update save sign to new inventory based GUI
Fix pet location when exiting the TARDIS
Don't set the destination if you're already there
Update the destination terminal step button lore when the config is changed ingame
Increase save-sign inventory to 54 slots
Set save sign text for new GUI, allow anyone to use save sign if isomorphic is off
Message should say 60 seconds
Remove the npc from the list