Add account mentions to comment replies

[randomperson189]

So polymer youtube has a way to reply to a certain account from within the replies section e.g "@ChannelName This is a reply". Rehike however doesn't have this yet and I do remember being able to somehow do it when hitchhiker was still officially supported.

[aubymori]

Temporarily, if you type @ and then the user's UCID, it should do it fine. For example, If I was in a comment's replies and you wanted to mention me, you'd have to type @UCa5v1cY8BB8DgrspVbfy-dQ before your comment. It's inconvenient, but it's the only way to do it for now.

[randomperson189]

Now I remember that was the way I did it before.

[randomperson189]

accidentally hit close button lol

[aubymori]

This falls under "HOLY SHIT SIMPLEBOX SUCKS AND NEEDS A REWRITE BAD"