Initial commit
Great, but all the directions for the turtle are reversed.
Follow now works, and crude stairs, but I need some clever conditional
stuff.
entrance stairs nearly work. Only build up to one level, though.
Steps work!
Roofs, pitched.
Last checkin before new exit technique.
New exit placement system; also Rooms are now Buildings, and the new
Buildings are subdivided by floors into Rooms, which are the things we
link with exits.
1) not enough exits
2) weird stairs in narrow rooms when not required
3) building needs refactoring to remove basic room
4) windows would be good
5) and internal stairs.
Loads of refactoring, stairs work, outside areas, the concept of outside
rooms so we can do roof gardens.

Roof gardens are next. Windows would be good.
Rooms refactored into a package now there are three of them. Working on
RoofGarden perimeter. Need to find a way to make roof gardens have more
exits.
Roof gardens work and rooms are refactored. Roof garden walls aren't
quite right. Fix those, then windows and perhaps some new building
types, with only certain points permitted for exits?
Rooms can now be open or closed on different sides, allowing for
full-side balconies and colonnades.
Roof gardens much better. Material manager added.
Merge remote-tracking branch 'origin/master'