There was a terrible bug introduced in 0809e20a6e -- clicking play on any of the default torrents in a fresh install of the app would fail and result in a 'path missing' error.
This fixes the bug, and also adds a migration step to clean up resulting broken config files
Before, if you added a magnet link and then tried to delete the torrent plus data before the file list was loaded, it would fail and throw an uncaught error
Fixes#803
Before, the app made itself the default torrent file handler automatically, pissing off some of our users. Now, it's not by default, and you can change it in the prefs.