* Add a tag for all exoplanet globes
* Add color to exoplanet globes based on their size
* Update color of terrestrial planets to be more deeply brown
* Change order so that the default texture for planets is shown on top
I.e. only use color if no other texture was provided
* Add descriptions of layer and planet type
* Add descriptions for some more things in the system
* Increase ambient intensity for when a planet is colored (not textured)
* Ignore GlobeBrowsing shader warning when setting camera position (closes#3405)
* Apply suggestions from code review
* Fix new constant names (from review)
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Co-authored-by: Alexander Bock <alexander.bock@liu.se>
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