Add DistanceDisplayCondition to CZML

[hpinkos]

Requested on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/X7Htr1bP2Tw

[hpinkos]

Started in https://github.com/omh1280/cesium/blob/b2bf5ae9e82ab89ea3e987d31a5a3ddcfdf658bf/Source/DataSources/CzmlDataSource.js

[kring]

This was done in #5986.

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/?hl=en#!topic/cesium-dev/X7Htr1bP2Tw

If this issue affects any of these threads, please post a comment like the following:

The issue at #4744 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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