writing components and groups support

[Zhuangkh]

Is support writing components and groups when creating a new model?
The WriteNewModel method seems to handle only faces, edges, and curves.

SketchUpNET/SketchUpNET/SketchUpNET.cpp

Lines 342 to 344 in eed3cd9

	SUEntitiesAddFaces(entities, Surfaces->Count, Surface::ListToSU(Surfaces));
	SUEntitiesAddEdges(entities, Edges->Count, Edge::ListToSU(Edges));
	SUEntitiesAddCurves(entities, Curves->Count, Curve::ListToSU(Curves));

[moethu]

sure, that should be possible. I'll see if I can give it a try by the end of the week.