When SdrPresObj's get constructed, e.g. when loading/
opening an Impress, the Styles for the PresObj's
(PresentationObjects) need to be constructed carefully
the same way as in former versions. This is a combination
of creating the SdrObject, adding a Style and setting default
Attributes, combined with in.-between corrections. All these
combinations make these fragile, plus the im/export using
ODF XML format and UNO API. With last SOSaw080 changes
not all places were correctly converted (mainly due to
new timing when and how a SdrObject belongs to a SdrPage).
Corrected this now, checked im/export/echange with
libreoffice-6-0 versions.

Stuff is more complicated that initially thought, see comment
added at AttributeProperties::GetObjectItemSet() for more info.
Adaption of the two UnitTest-Files is explained there, too.

Change-Id: Ia90a37492f3a92030790fbd27b7c532883bce923
Reviewed-on: https://gerrit.libreoffice.org/55029Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>