Craft: small refactoring and GUI rework done, back to City development!

As mentioned, I have refactored crafting interface, so it is ready big expansion I plan for this part of the game and GUI is not longer as horrible as before.
Just a little bit ^_^.

I am back to City development and going to start with poor districts near the city wall.
Also, generator doesn't respect a side of a wall and may place few houses from outer side of a wall.
It is easy to fix, but I am not sure of it. Theoretically, the poorest people may settle outside of the city wall.

Districts near city walls should have guard posts and guards patrols, houses of poor people, vagrants campfires, garbage dumps and so on.