Allow Markers to have a start AND stop(or duration)

Final Cut Pro and Adobe Premiere both have support for markers that are like a subclip, rather than a single point in time. Internally, this only involves adding a duration or an endpoint to the marker table.

Then instead of simply displaying a marker tag in the timeline that is only shown when the playhead is locate on that exact frame, the marker is displayed on the timeline and clip window, and the text of the marker is optionally displayed anytime the playhead is within the marker. Markers can overlap, but that's okay, even if it gets a bit messy on the display.

When a marker is selected from the list of clip markers, the clip should be loaded, and start/stop points should be set for the clip to match the marker.

We can use the same keystroke to start and end a marker (Ctrl-Shift-M), or use another one for end the marker The pop-up box for the marker should only happen on the "end", so the process would be: "see something that needs to be marked, click "Begin Marking", play the video, stop it, hit Crrl-Shift-M or "Stop Marking", a prompt comes up with the text description and the marker color.

I think it's important to navigate ALL the markers, not just markers by clips. Let's say you want to mark clips that are candidates for a trailer, or closing comments, or whatever. I want to be able to say "Show me all the markers, filter by whatever color (or even search)" then let me see those clips. Currently markers are within the clip only, so you have to go to each clip to see what markers might be candidates. As such, Markers could even have their own menu items, they're somewhat buried right now, and they're my favorite tool! Markers can be like subclips, but with the additional text and categorization they're really quite handy.