Calculate and display aspect ratio

Issue #3 new
Baron Roberts created an issue

One of my most common uses for Meazure is to figure out the aspect ratio of video clips. I'm not referring to the pixel dimensions of the video stream, but the actual non-black part of the video displayed. I use Meazure's Rectangle tool to find the dimensions, but then have to use a calculator to figure out the aspect ratio.

Please consider adding aspect ratio to the displayed values for Line, Rectangle, and Window tools.

I've been assuming all along that it would be impractical for Meazure's zoom panel to actually show video streams because they are displayed using video overlay mode. If it is not, it would be most helpful when measuring video dimensions to actually see something in that zoom panel.