Updates to the skybox system

We've recently changed the way skyboxes worked. As you might know, there used to be a fixed number of choices, in a list style dropdown under the Scene properties. It used to look something like this.

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This was a bit of a pain, because you couldn't use your own skyboxes. We've changed it so that you can! You should now see the texture map picker in place of the dropdown.

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Virtulous can import sky maps in 2 formats, the horizontal cross, and latitude/longitude. A horizontal cube is formatted like this

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A lat/long map is more like a square image that is distorted at the top and bottom

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Just choose the proper format from the dropdown.

For those of you using the demo environment settings - I've updated them, but your scene might be out of date. If you see the skybox is rendered, but no longer seamless, and you see edges, just drag and drop the environment settings again.

You can upload a skybox to the texture server, but until we get the map picker integrated with the repo system, you'll need to place the URL directly into the texture picker. Find the plus, and enter the URL from the asset repo.

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