Add geographicToScreenPoint function (ported from Android)#844

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EMaksymenko wants to merge 1 commit intoNASAWorldWind:developfrom

WorldWindEarth:enhancement/geographic-to-screen-point

Commits on Dec 7, 2020

Add geographicToScreenPoint function and related logic (https://github.com/WorldWindEarth/worldwindjs/issues/28).
EMaksymenko
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