Block a user
Edit building Y-rotation directly in building editor
edit cursor position in building editor
edit current building position in buildings editor
Edit building transform using line editor controls
implement UI to edit line building
roads: road meshes are generated poorly
Disallow editing for generated buildings
Should be done after line assignments to all generated buildings.
Actual editing should go through lines.
Store building key independent of transform
Store building key independent of transform
Monitor updates to _road lines and trigger rebuilds