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This attempts to solve bug [#714921](https://bugzilla.gnome.org/show_bug.cgi?id=714921). They are available as two buttons on the format bar, next to font options. The icons I used are taken from a free icons site just for demo purposes and should be replaced by new icons. Also I did not include hotkeys mainly because I could not come up with a good one, also they are pretty uncommon I think. Also added new icons to icons/CMakeLists.txt
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