Additional corner tracking added

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I've now added the abilities to attach feature markers to corner areas. This is a handy thing to be able to do, as you may want to put a marker on the corner of a window, or building, or something like a set marker.

Here's an example video of a corner on the graphics on the side of the caravan being tracked:

It's a really good result. And, it only took around 5 minutes to complete. This includes doing a frame-by-frame analysis and making any adjustments along the way using the new calibration helpers. I've called them calibration helpers, because you can calibrate the result against another frame (for example) if the track drifts, or fails for some reason.

Here's a side-by-side comparison of the start and end frames, pictured in their track window state:

On the left is the starting frame, and on the right is the end frame

I also changed the icons for the tracking backward/forward buttons. I was using the same icons as the viewport controls interface, and I would occasionally mix them up and get something I wasn't trying to do! Now they're more easily identifiable.

My little tracking engine is really starting to shine. The additional helper and calibration commands are making it a real delight to use. There's still a few more helpers I'm trying to add as well.

I can't wait to get a pose estimation out of all this!