[Feature request] Easy import of saved posts and subreddit list

Hello, thanks for the amazing app!

I recently finished exporting a large number of reddit subscriptions to stealth. It was a fairly complicated process, which I expect would've been much easier if I could have input a list of all subreddit names into the app. The recommended method of getting mine.json is flawed since reddit forces only 25 entries, no matter what.

I managed to do mine by formatting the entire list, which I got immediately from this, into that used by stealth's backup file in sublime editor with a dummy time value. I think this could have been a basic feature of the app already and that not many people care about having icons for followed subreddits.

I want to export reddit's saved links too. The json from reddit does not have all the information needed for stealth so I did not try it but I wish this process were as simple as pasting a list of links into the app.