0032679: Data Exchange - STEP writer loses assembly instance name

0032679: Data Exchange - STEP writer loses assembly instance name

In STEPCAFControl_Writer::WriteNames, write the names of components
even if the name of the assembly is absent.

In STEPControl_ActorWrite::TransferSubShape, move assembly structure
information to the beginning of the list of results, so that CDSR
information of this assembly became preceding CDSR of any sub shapes.