Updated help browser in order to display images and handle internal references. Dropped ACG stylesheet since QTextBrowser does not support CSS2.

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Replaced old QTextBrowser by QWebView which offers more functions to properly display the help sites.
Search now opens a small window at the bottom which displays "all" searchable objects. These still have to be filtered.
Clicking links now gets handled by HelpBrowser such that requested pages can be load out of the help engine
which uses in fact it's own domain namespace and is therefore not accessible by QWebView.

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