Clip Editing

Mike and I were talking about the asset pane when he raised an interesting issue: double-clicking on an asset in the asset pane opens it in the editor -- so what happens if you double-click on a basic asset? It seems like it'd be useful to be able to do some basic editing on an imported clip -- trim out some frames, maybe play with the audio levels, that kind of thing.

At the time it seemed like a bad idea to me, but I've warmed to it as I've thought through it more. Ideally you're doing video cleanup in another app, but if you just need to trim a little off, why not be able to do that (non-destructively) in Moing? So, I think the rule for editing basic assets is pretty much:

1. Still Images
   You can view the image in the editor field. The transport controls are disabled. Nothing interesting in the timeline.
   
2. Clips
   You basically get a restricted set of features from sequence editing: you can play the clip in the editor window, and in the timeline you start out with a segment for video and one for audio, as applicable. They can be split/cut/extended/reordered, etc., but you can't otherwise add new segments. Not sure what happens if you try to delete the last remaining audio or video segment; maybe it doesn't let you.

For clips, any edits made would be stored (in sequence format?) in a file alongside the original clip file.

*Update*: for still images, we should probably launch an external editor.