Improvements for Onshape openBoM integrated app users

If you're an Onshape user, we continue to add new enhancements we hope you'll find useful: an option to create a single level BOM (in addition to a parts lists which is what's available today), an improved layout of the integrated BOM, and to prepare for the upcoming release of BOM for Onshape drawings, a BOM drawing view property to select what items appear in a drawing and BOM view configuration tool.