Added TabCompletion for the '/test' and '/se' commands to provide support for the Arguments included in that command such as '/se silentjoin' and '/test motd' as 2 examples.
Fixed a bug where you can't use the '/tpacancel' command due to a NullPointerException
Fixed a bug where players with the 'se.tpahere' permission still can't use the command
Re-Organised the '/se' command and also fixed a typo where it said '/test join' twice.