fix: make support concentric infill have wall so that the first wall is the outer wall (CURA-3579)
fix: make support concentric infill have wall so that the first wall is the outer wall (CURA-3579)

concentric infill used to be generated from the inner most wall of normal objects,
but that caused the problem that we effectively have one wall more than the wall_line_count;
this bug was fixed some weeks ago.

The fix of that bug made concentric support fail, because the first concentric ring was printed at the support_line_dist from the outline of the support areas.
Now instead of generating concentric infill from the edge of the areas, we just explicitly print the outer wall as a support wall and the inner rings as normal concentric infill.

alephobjects/CuraEngine,Ultimaker/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine