We was saving everything again when the players stop creating anything,
this was causing issues with duplicate cells when using any storage with
SQL (due to insert and no primary key).
Also, added a hasChanged to the cell class which will prevent resaving
things in sql if it hasn't changed.
I want to get fully away from blocking methods and instead make the
user/player/prisoner/whatever wait to get an answer while we retrieve
the uuid information asynchronously.
