Add comments for individual rounds of a demo

[Asviix]

What problem is this solving

When I organize clips to record them, instead of only tags, I'd love to put comments on individual rounds.

Proposed solution

Add the ability to add comments to individual rounds.

Describe alternatives you've considered

No response

[Asviix]

Looking at the commits it seems like it's gonna be added, thanks a lot for listening to suggestions!