feat: added a view mode button to the main toolbar.

Closed Magno Lomardo requested to merge magnussolidus/okular:feat/interface/btn-exib-mode into master

I felt the need for a view mode button at the main toolbar. Couldn't find a way to add it without touching the code.

This commit basically adds the button to the default toolbar in order to allow the user to switch the view mode without the need to go over the menus.

Edited by Magno Lomardo

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