[Feature request] Prompt before opening external links/apps

[SpitFire-666]

Sometimes it's hard to tell if a post/comment will open in an external app, eg my web browser or youtube app.

I would like to at least be asked before leaving the RedReader app. Often I won't bother with a link if I know it's going to fire up a different app.

Maybe external links could be a different colour or have a tag like EXTERNAL

Cheers