Update ol-cesium to the latest version 🚀

[greenkeeper]

The devDependency ol-cesium was updated from 2.2.2 to 2.3.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for OL-Cesium v2.3.0

Essentially some oldfashioned / ES6 module usage improvements.
Notably, the ES6 module code is again available in a convenient way in the https://www.npmjs.com/package/olcs package.
For oldfashioned builds, if you need to access internal OpenLayers APIs you can use https://github.com/geoblocks/legacylib/tree/master/ol5 to build a full version of OpenLayers.

Commits

The new version differs by 40 commits.

• a3a64e1 Merge pull request #658 from openlayers/prepare_for_2.3
• bc042d8 Fix Cesium requestRenderMode usage
• ccaaef5 Migrate to Cesium 1.49
• 1987399 Remove useless CSS extraction
• 9b1ec45 Prepare for release
• 3a7fb0d Dependency updates
• 76741c1 Use Cesium.Ion in the image static example
• d1a05ad Implement a smooth rotation in the rotate example
• 26623b7 Fix regression
• db913c2 Merge pull request #657 from openlayers/update_documentation
• fabfece Document interactions limitations
• 84617c6 Update integration documentation
• 91ee49d Merge pull request #656 from openlayers/internalize_additionnal_ol_functions
• 2cfb926 Stop using import * in the code
• 78f45f8 Stop using OL-internal removeChildren and removeNode functions

There are 40 commits in total.

See the full diff

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