Update CMakeLists.txt files.
Removed WindowW/WindowN from Tilesets.txt.
BuildingEditorWindow: Force visibility of some widgets to true.

In another branch I am working on switching between editing modes which
works by hiding some widgets and showing other.  The visibility of widgets
is saved by QWidget::saveGeometry().
Updated the building *.txt file revision numbers.
Removed long-unused RoofTiles.txt.