Neptune true color fix (and Uranus and Titan updates)

[charliewhitfield]

If you follow astronomy stuff, you probably noticed that everyone (just now) discovered that the deep blue Neptune we've all come to know isn't true color. Well, the authors never said it was. But that's what went to the press in 1989 and it stuck.

Here's the story from Dr. Becky (YouTube)
New color analysis publication

At first I was disappointed. But I'm coming around to it. Uranus and Neptune are much more similar than we all thought, which makes sense from chemistry. But not identical by any means!

Here's the corrected color from the new paper (snipped from Fig 8c). These are our new reference images for Uranus and Neptune, which are both updated in the newest dev assets.

While I had Photoshop open I also replaced Titan assets. It was previously a radar image (simply because that's what I found online). Now it's a "true view" smog ball that I created using this image as reference:

BTW, in case you are not following the changelog: The core editor plugin now manages assets updates! If you update to the current master branch and open in the editor, it'll check your assets version and offer to download and add the newest version. (This will be in the upcoming v0.0.18 release.)