cleanup: remove html prefix/suffix feature from navigation widget
This was *only* being used by the project file quickopen feature, and you only saw it when clicking into the quickopen list, or when pressing alt. I doubt anyone ever did that. And it was madness anyways: we decreased the font size in a hacky non-html compliant way which actually made it quite hard to read for me. So the only thing we lose is the project name... which is an acceptable tradeoff. This feature messed up the whole API considerably, removing it makes me very happy. We can bring back the project name in the future by introducing a generic wrapper-widget that supports the QuickOpenEmbeddedWidgetInterface.
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