Plane Picker Feedback

For (metaaction) shapes that you pick a plane (like rectangle, circle or cone), before you will do the first click, you will have a preview circle that will show clearly the plane you draw.
Dragging points in editing mode will update the coordinates and also will preview it nicely.
NodeBuilder class which is responsible for a shorter code (and also guarantees correct creation of shapes) have a shorthand to use it's dependencies, so the old code was:
var builder = new NodeBuilder(...);
builder.Dependency[0].Point3D = v1;
and the new code is:
var builder = new NodeBuilder(...);
builder[0].Point3D = v1;
which also makes sense in builder's context and it's code usage.