feature request: drag and drop settings import

While Mp3tag has a function to export its settings, in order to import those settings, users are required to go rooting around in the file system. Not a big deal for some people, but too much for others.

If the settings archive could simply be dropped onto the application window so that Mp3tag could unzip it and put the various files where they need to go, then the entire process of migrating preferences would be completely streamlined, self-contained, and effortless.

I've seen this sort of functionality in other programs, and I think that it would be a valuable addition.