Make the Overview Map Plugin use QIcon instead of QSvgRenderer and create an About dialog for it.
completed by: marthd
The Overview map plugin is currently using QSvgRenderer to render the overviewmaps. We'd like to allow for usage of other graphics formats as well (PNG and JPG for example). This requires a few changes in the overviewmap code and in the configuration dialog.
Additionally an about dialog should get created for the plugin which displays a proper description, copyright info and license.