Introduce new QString id() const-API and sort wizards by
[untranslated] category and id. Introduce respective constants.
Rubber-stamped-by: con <qtc-committer@nokia.com>

... based on the git clone wizard. Provide a wizard for browsing
gitorious hosts.

Task-number:  44831

Move GitClient::filterUntrackedFilesOfProject into submit editor.
Make checkout wizards use page lists for greater flexibility.

Task-number: 244831