qol: editor/recording timestamps and flags

Hey, I found that whenever I accidentally record some things i don't want in the video, I write down the timestamp that it was at so i can cut it out later. I find it a little hard to do this as I would have to scrub through the video without any timecode letting me know the exact time i am at.

Something like a timecode overlay would be really nice to know the exact time I am at.

Also, a feature to flag the current time (while recording) to show a flag in the editor itself (after recording) could be nice too.