tdf#129183 sw: textboxes in group shapes - part 3

Grouping/ungrouping nested groups works now.

Manual test:

1.  Insert Shape.
2.  Right-click on selected shape, Add Text Box (and some text).
3.  Insert a new shape.
4.  Select and group the two shapes.
3.  Insert a third shape.
4.  Select and group the shape and the previously grouped shapes.

The text box remains in the nested shape group.

Details:

1) tdf#144271 memory leak of SwTextBoxHelper, by replacing the
textbox structure vector with std::unordered map, and rethinking
of the ownership of the objects. If a SwFrameFormat dies, and that
is a FLYFRMFMT, it will be deleted from the textbox node and the
FrameFormat table in the doc too, and the drawing will be stay as
it was before. If the dying format is a drawing, all the textboxes,
and the node will be deleted.

2) Introducing the new UNO property TextBoxContent, which is needed
for writerfilter/xmloff later to set a new textbox for the shape
via UNO.

3) Missing parameters are present now for syncing the textbox
parameters.

4) Introducing a new function namely the handleGroupTextBox() to
do the tasks simply with all textboxes in a group shape.
This can handle nested groups as well (group in a group).

Known issues: now copy of nested group objects is implemented
but not enabled, because it causes an assert.

Change-Id: I931886eda01c7a3db93098de10f5e5f48f2f217b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/124657
Tested-by: László Németh <nemeth@numbertext.org>
Reviewed-by: László Németh <nemeth@numbertext.org>

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