Dynamic geometry updater inheritance

[hpinkos]

Use inheritance for DynamicGeometryUpdater classes to reduce duplicate code
I think this will be the last of my DataSource refactor/cleanup pull requests.

TODO

• Merge Geometry updater inheritance #6246
• Merge Clean up dynamic geometry creation #6249

[cesium-concierge]

@hpinkos, thanks for the pull request! Maintainers, we have a signed CLA from @hpinkos, so you can review this at any time.

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[mramato]

Please merge in master.

[hpinkos]

@mramato ready

[mramato]

This example looks broken: http://localhost:8080/Apps/Sandcastle/index.html?src=Rectangle.html&label=Geometries I actually think it was one of your previous PRs that broke it (master is broken too but worked 7 commits ago). Might as well fix it now.

[mramato]

Whitespace

[hpinkos]

@mramato just fixed the rectangle issue. And thanks to inheritance I just had to fix it in one place instead of like 10 😃

[hpinkos]

This should be ready now

[mramato]

Thanks!