0030945: JT Import, JtProperty_LateLoaded - expose type of Deferred object

0030945: JT Import, JtProperty_LateLoaded - expose type of Deferred object

RWMesh_NodeAttributes has been extended with NamedData property for passing Metadata.

RWMesh_CafReader::addShapeIntoDoc() has been corrected to avoid
adding calling XCAFDoc_ShapeTool::AddSubShape() for sub-shape labels.
Attributes for Products and Instances are now set independently to shape labels.
Sharing of Compounds (previously always duplicated) as sub-Components has been fixed.

TDataStd_NamedData has been extended with interface for deferred data loading.
Setters have been corrected to avoid duplicating lookups within map.

# Conflicts:
#	src/RWMesh/RWMesh_CafReader.cxx