openMapper v0.1.12

Fixed

• A junction's roadway is as high as the roads' surface (#39): road types drawn above the line they are laid along (the road maker's own sit 10 cm over it) got a junction whose asphalt lay that much under the roads and the kerbs; the plate's roadway now takes the height of the roads' surface.
• No crash on exit on Wayland (#37): the program ends right after saving instead of tearing its threads down in order, which crashed in libwayland-client on some Linux systems.