API: update distToShape built-in docu
API: Update docu strings of methods of BSplineCurve
API: improve built-in docu for copyObject and moveObject
OpenSCAD: fix replaceChild
PartDesign: reverse XZ plane to match legacy orientations
Attacher: fix superPlacement applied twice in some cases
Attacher: remove #include QString
Attacher: fix typesystem (forgotten ::init())