SmartArt: Diverse changes for SmartArt handlingHEADmaster

Changed the DiagramImportSize no longer be handled/held
as part of the DiagramModel part, but with the change to
use the XShapes/SdrObjects consequently use the
transformation from there to be consistent.

With that change also added own impls of
TRGet/SetBaseGeometry to SdrObjGroup. There were none,
thus the defaults from SdrObject were used. This is
mainly correct, but since SdrObjGroup is based on
GetSnapRect() it already contains the evtl. existing
anchor offset (from SW), so the results were wrong
for SW.

Secured the knowledge if we are in Im/Export by adding
methods for is/inc/decImportExport to SdrModel and using
these. Locking the model was pretty safe, but e.g. missing
for import. Still added it there to be consistent with
other imports, may also bring some speedup.

I have cleaned LayoutNode from the member
'SmartArtDiagram& mrDgm' since LayoutNode is model data
and with that in place it would have been necessary to
deep-clone or re-import the complete DiagramLayout,
just to make sure that those members of SmartArtDiagram&
will reference the correct - newly created -
SmartArtDiagram.
That again would have been hard to keep under control
due to LayoutNodes hosting a full hierarchy of LayoutNodes
in it's base class LayoutAtom, so complicated deep-copy
and need of virtual Clone method at LayoutAtom to do the
right thing for all eight derivations of it.
This is now no longer needed. It can just stay shared, thus
the DiagramLayoutPtr gets just copied above. This reflects
that the layout mechanism hosted by these atoms is not
changed itself, but used (in some ForEach manner) to create
the shapes, so does not need to be changed itself.
It gets now just additionally referenced by the
SmartArtDiagram copy costructor. That is for non-deep
copy/paste where this copy operator is used.
Instead of deep copy the SmartArtDiagram constructor with
import from boost::property_tree has to be used which will
have to re-import the layout model data to mpLayout anyways.
Instead of having SmartArtDiagram as member it now will be
handed as needed to import contexts (LayoutNodeContext and
derivatives).
All those classes are used temporarily and are not part of
the model. It also gets handed over for shape re-creation
in LayoutAtomVisitorBase and it's derivates. Also those
classes are used temporarily and are not part of the model.

Added detection of click on Diagram frame in SC and SW to
get the Dialog working as in SW and SD to be able to test#
some stuff.

All still secured by ACTIVATE_ADVANCED_DIAGRAM_FEATURES
and wirk in progress, but some stuff is looking better.

Change-Id: I660b205155a4e317585035ec3cacddbc96db08c7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/200875
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>
Tested-by: Jenkins

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