[Feature Request] Add option to import/export list of installed apps

It happens that when changing a cellphone, ROM or making a factory reset, you loose everything (obviously). So, it would be great that F-Droid had a feature to create a list of F-Droid-installed apps, so I just import that list (e.g. it could be a plaintext file with the apps' names/IDs) to my new device and F-Droid automatically download and install those apps.

And a more elaborated idea, is to also support (optional) installation for specific versions of the backup list, and most importantly to add a warning when there are not-found or incompatible apps, instead of failing and being unable to install the rest of the working apps.