LayerGroups basic raster sync about ol-cesium HOT 8 CLOSED

A simple implementation which will include all layers in the LayerGroup hierarchy will be part #25.
The layers will be added individually and information about group is not passed to Cesium.

Advanced impementation of LayerGroups with listeners on opacity/hue/.. of the whole group is to be implemented later on.
Updated: there is #93 now.

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The simple implementation done in f2709f2 and included in #25

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Note from our client: "Our application uses several layer groups to make z-indexing and layer management very straightforward. The layer synchronization in ol3cs should be listening to change events from layer groups so layers stay synchronized between the map/globe."

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Basic implementation for syncing layers which are inside of a LayerGroup has been done.
This is fully according the specification from #10.

Advanced implementation of LayerGroups - which would allow changes of opacity of a LayerGroup - influencing opacity on all individual layers inside of a group goes beyond the original specification.

@ahocevar - is there a bug report from the client on existing implementation of the LayerGroups?

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Closing this ticket - if the advanced "Visibility & opacity of LayerGroups" should be implemented lets create a new ticket for that...
Updated: there is #93 now.

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@klokan, the issue is with collection changes on layer groups, not visibility/opacity/etc. If a layer is added to/removed from the group that change should be reflected on the globe. We aren't changing display properties at the group level so we're not concerned about that.

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OK. It is now more clear and it belongs to this ticket. Reopening.

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Implementation available in the PR #88

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