[GSoC] Weekly Report #2 - Toolbars infrastructure via .ui files

[Szymon Kłos]

This week I made possible reusing controls from Slide Transition Pane.
I had some problems with early initialization. Similar problem I met in
the paragraph spacing controller which I didn't finished yet.

Tasks not related with GSoC:
I've updated my GDrive 2FA patch after review. Also I fixed one bug in
the AutoText Dialog. While using it I noticed that interface wasn't
updated after user actions.

Regards,
Szymon