Various things

[Pilihp64]

This is mostly for myself (or I'll never do it), I should get around to this in a week unless you want some of it sooner.

BUG
-- Living Wood doesn't revert, it tries growing a tree instead.

NEW
-- Add slope/half-tile usage for deletes, and track hammer for changes.
-- Allow multiple users to be rolled back in one command, If a building is destroyed by multiple people, rollback one at a time will not properly revert furniture in certain cases.
-- Add a command to undo the last rollback, so /rollback is not depressingly permanent if you mess it up (or want to change it for any reason).