Replaced empty spinner with the document title in the Main (viewer)
activity. Had to edit the themes to not disable title, and edit the
manifest to make the desired activities use that theme. If the theme
is set in the "application" tag, it will apply the theme globablly.
Also cleaned up and tightened the ToolbarController.

Change-Id: I5099860787b5f84d01c98c5e53ade519c2f89cc4
Reviewed-on: https://gerrit.libreoffice.org/33306Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Aleksandar Stefanović <theonewithideas@gmail.com>