Make fog color correspond to atmosphere color

[laurensdijkstra]

So instead of this:

We could have something like this:

This is just a simple PhotoShop so not at all physically correct. Perhaps that can be improved by the shader computations.

If this specific feature is not feasible then it would be nice to get a color property on the Fog class, so we can set it manually.

[hpinkos]

Also requested here: https://groups.google.com/d/msg/cesium-dev/usloCw9TvAM/UjLQtE5EBQAJ

[hpinkos]

Also requested here: https://groups.google.com/d/msg/cesium-dev/OErvYg3v_mY/n0cnLWrYCQAJ

[pjcozzi]

The fog color now matches day/night intensity (but not the orange dusk/dawn) in #5934.

[xtassin]

Much needed indeed. Giving control on fog colour would be best.

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/d/msg/cesium-dev/usloCw9TvAM/UjLQtE5EBQAJ
https://groups.google.com/d/msg/cesium-dev/OErvYg3v_mY/n0cnLWrYCQAJ

If this issue affects any of these threads, please post a comment like the following:

The issue at #4195 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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