CzmlDataSource updates

[shunter]

• I added some missing Ellipsoid properties which were left out of Refactor DynamicScene to use Geometry & Appearances #1444
• I reordered the lines that process each CZML property to be relatively consistent, and to match the order of properties in the CZML schema. Loosely, I put them in the order:
  • show
  • fundamental/required properties (e.g. "image" or "text")
  • other definitional-type properties
  • fill & fill material
  • outline, outline material, outline width
  • other esoteric features

More changes to come in future PRs.

[mramato]

Thanks @shunter