Allow users to export/import Tor VPN's configuration
Due to the realities of signing the VPN apk, we will not be able to upgrade the VPN installed through the Google Play Store with either our own self-hosted APK or F-Droid's APK. This means if there is an interruption in the availability of the app on the Google Play Store users will necessarily need to transition to either our own self-hosted APK or the APK on F-Droid, but they will not be able to do an app-to-app upgrade meaning any configuration (bridges, per-app settings, etc) will be lost.
We will probably want to provide some functionality to export and retore settings to work around this.