Implemented Hidden AreaExits

I've added a bool to AreaExits that allow them to be identified as a
Hidden exit.  Hidden exits still have to be manually added to the
database but with this bool in place they won't be used when trying to
find the AreaID - before this update a manually added hidden exit would
cause an Area to be re-created in the database.
Removed vicars and sawmill supervisors

Vicars and Supervisors tend to be too difficult for the bot to handle
and end up getting it killed.
Added strip to help parse line break items

Line breaks add an extra space to the inventory list.  I'm not sure the
best way to make this fix so this change has been added as a stopgap
until Laurier's permanent fix can be added in.
Added GotoThread
The GotoThread properly implements the goto / showto commands so they can function similarly to the Crawl / Bot threads.  The hooks in the command handler have now been removed.

Future enhancements may include having the bot and crawl threads use this thread to manage all movement.