Simplify onboarding process by offering to clone or optionally replace existing device

When setting up the Chrome extension or Android device (sorry, have no Windows to know if this would work there), offer to clone settings from an existing device of the same type in the new one and optionally offer to delete/replace the device being cloned from.

This would allow a user to easily migrate devices (phone or computer replacements/upgrades) while also providing the user with a backup of all settings for each device type.