Add tab completion to `/tardisbook` command
Set the correct amount for the energy achievement
Catch an empty amount
Use inheritance, like a good OOP boy should
Fix broken `/tardisbook` command
Revert "Set the correct amount for the energy achievement"

This reverts commit 35a60557dfee07089b5856836bae8f8b52840d5c.
Fix broken achievements
Remove debug statements
Make Siege Mode persistent across server restarts