To allow free rotation of Graphic FlyFrames in Writer,
several adaptions are necessary. This change takes care
of all needed changes to internally support a freely
definable rotation angle for that case. Save/Load round
trip is working, the graphic does no longer get modified
and added in 90-degree-changed state to the object, the
original will be preserved. Support for needed slot in
core/ui is implemented. Rotation can be applied from
Menus/Toolbars in the known 90/180 degree steps. Added
a slot/Button/command to reset rotation in these cases.
Added support in Sidebar to rotate using the rotation
wheel and/or numeric field. These fields and support added
to Image TabPage, too, fully functional.
Missing now is a solution for displaying the rotated
Graphic. For now, it just gets rotated, but this will not
be the final state of this change.

Change-Id: I6f3b85ebb5be2b4ad3311c536d54f27a37a494e7

RotGrfFlyFrame: Linux build adaptions

Change-Id: I365287ecd6525b1972e8436d61332f7121d88649