SmartArt: Undo/Redo, SubSelection, Locking of IAsHEADmaster

Moved creation of Undo/Redo actions for geometry changes directly
to the methods addDiagramNode/removeDiagramNode of class
DiagramHelper so that not every caller has to do that again.
Removed from DiagramDialog where that was done before.

Extended DiagramDataState which is used for SdrUndoDiagramModelData
with needed Model information. After using SdrModel/XShape data
as part of the DiagramModel it is necessary to also keep that
info when geometry gets changed. Also the current transformation
of the group hosting the Diagram is needed. Also the end state
of change in SdrUndoDiagramModelData is now late-evaluated
to get the changed state. This is needed in redo, so evaluating
this if undo is used is the thing to do.

Added a general mechanism to apply locks to the SdrObjects,
see applyLocksToDiagramObjects. It currently sets MoveProtect,
ResizeProtect and DeleteProtect. These get un-set when the
Diagram is reverted to a simple SdrObjGroup to not hinder
further editing.
There is currently no ToFront/ToBack lock or others which
may be needed. In principle all geometric changes to objects
of the Diagram need to be blocked.
Also still missing is that the BackgroundObject has no
LineAttributes, or better is not allowed to have these due
to mso only offering a FillStyle for that object. Not sure
yet how to do that.

Added a mechanism to automatically delete the buffered
original data when attributes change, see
ItemSetInformationChange. This is triggered by
AttributeProperties::ItemSetChanged, but needs to be
prevented during import (which also changes Items).

Added support to delete the SubSelected object if it
is a TextFrame. This leads to geometry change and
re-layout and also creates a Undo action now.

Attribute access to SubSelection is done in
SdrEditView::MergeAttrFromMarked/SetAttrToMarked
so that attributes can now be changed like for
regular objects.

Also some methods in SdrMarkView had to be adapted to
work with the SubSelected object.

Extended Diagram SubSelection to make tab/ShiftTab work, including
from where the Diagram is entered. Also made direct MouseKlick
work.

Added simplifications to work with Diagram stuff, some
tooling directly at SdrObject.

Due to UnitTests I reverted the decision to have all SdrObjects
in the Diagram 'flat' without Groups. That would be easier and
is what the import of MSO visualizationm replacement often uses,
but not what a reLayout creates.
Those complaining tests are the pptx ones that have no replacement
graphics (no drawing*.xml) and have to be re-layouted using our
mechanism as existing so far.
So keep groups again for now. Price is that all stuff handling
SubSelections has to use SdrObjListIter instead of SdrObjList.
That makes it somewhat more complicated, but work on a virtually
flat hierarchy of SubObjects in any case - maybe safer for the
future.

Also looked at that Locking oif SdrObjects again also due to a
test. I wanted to use the extended/newer stuff, but applying it
made the office crash. After some debugging I found that in
SdrObjList::RemoveObject the remove is *cancelled* when
SdrObject::IsDeleteProtect is set for that object. Unfortunately
that remove is due to moving the object to another target
list, so it should happen.
This is probably a relict of very old stuff, to prevent object
delettion that way (!). For now I use the fact that this happens
during import.

Change-Id: Ied2263928106e2cb02047e2e9a55c680384b2932
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/201497
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>
Tested-by: Jenkins

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