SVN_SILENT made messages (.desktop file)
Introduce KDevelop::htmlToPlainText
Use KDevelop::htmlToPlainText where applicable
Navigation: Now possible to display HTML comments

This is similar to what QLabel.textFormat == Qt::AutoText does.
If Qt::mightBeRichText(s) for some string s is true => assume it is
rich-text/HTML and render it as such, else assume it's plain text.

This will be useful for upcoming changes in kdev-clang
Minor: Remove unneeded includes