Implement placemark level of details selector#843

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EMaksymenko wants to merge 1 commit intoNASAWorldWind:developfrom

WorldWindEarth:enhancement/placemark-level-of-details

Commits on Dec 7, 2020

Implement placemark level of details selector (https://github.com/WorldWindEarth/worldwindjs/issues/34)
EMaksymenko
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