Added new permission node for party teleportation.

`mcmmo.commands.ptp.send`
This permission node will be check before sending a teleport request
(or teleporting the sender if no request is required), this allows
admins to grant certain groups of users permissions to accept incoming
party teleport request without being able to send ptp requests
themselves.

Closes #927
Minor formatting, added a missing white space
Display partial names when trying to use the ptp command
Update the changelog