Open Files, Command Output, and Notifications Updates

[ssigwart]

• Filter option for open files.
• Comment output clear option.
• Notifications clear option.

[Naatan]

Hey @ssigwart ! This is awesome, really appreciate the work here! But could you please submit these as separate PRs? You're doing 3 wildly different things all in one PR. Makes it hard to review each in their own merit, since we're not just reviewing the code, we're also reviewing feature implications.

[ssigwart]

I split them up. I didn't know if you'd want 4 PRs in a day.

[th3coop]

I didn't know if you'd want 4 PRs in a day.

We loves PRs.