Rework of the sidebar(GSoC WR#4)

[Rishabh Kumar]

1. Completed the task of shadow tab.

2. Area property tab - problem faced while porting the Import button to the
sidebar. Bug report was filed.

3. Slide background tab(#89466) - New SIDs were added. work on Master slide
section is in progress. The other controls are working fine.

4.  Interaction section tab(#89667) - preliminary task of adding a  new tab
to the sidebar is completed.
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