Select Divided Surface Families (MAGN-3338)

- Fixes http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3338
- For compatibility with 0.6.3, we need to extract the Divided Surface
Families from Forms as well.
- Implemented ElementSelector.DividedSurfaceFamiliesByUniqueId and
ensured the selection node calls this method.

/// <summary>
/// Gets list of DividedSurface families from the given uniqueId. If given
/// uniqueId does not refer to Autodesk.Revit.DB.FamilyInstance, then it
/// gets the list of families using DividedSurfaceData.
/// </summary>