Editor in progress
 - All cliffshape data are stored in xml files (assets/data/maps)
      Note : noising of natural face is visible in xml, but not fonctionnal for now.
 - Interface changes
    1 & 2 to toggle between cliff and height tools, more tools to come (assets, ground texture, units...)
    a, q and w still change the selector shape
    z toggle between two preconfigured cliffshape
    RMB, LMB to activate the selected tool. Note that action may be maintened over time
 - manage many cliffshape with any set of manmade faces (models), natural faces (procedural) and trinkets
 - the selector act now like an airbrush to upper and lower tile, for convinient smooth effect. More effect to come (noise, full)
 - shadows are back !

Some bugs to be fixed with top and bottom grounds of manmade cliffs.