Made use of const string& when possible in the GameMap class.
Danimal's New dormitory texture + new wall texture. Also made the walls colorable.

As discussed with Danimal.
Added support for new Gold Stacks from Danimal.

I also made the goldfullness enum more relevant and commented their use.

I removed the olf gold stack mesh as they really ugly compared to the new ones,
and I replaced one bed being the chest by the stronger gold stacks.

This is looking shiny! :)
Added new and shiny Troll and Rock Golems by Dm3D, prepared by Danimal. :)
Centered the exit pop-up
Fixed an unhandled render request type seen in logs.

The Room Object deletion request wasn't handled.
Merge branch 'Bertram25-development' into development