getCapabilities improvements

[sjoerdbeentjes]

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[Tjalling-dejong]

There was an issue with downloading the CDDA data layer with the rws viewer. I figured out that the layer data also has a downloadUrl attribute that is not always populated. The CDDA dataset has a WMS and a WFS service. So the getCapabilities request will work for both service types. This will cause an error when trying to download because the viewer will attempt to download from the WMS url instead of the WFS url. I fixed this by adding a check that checks if there is a downloadUrl attribute in the layer data and use that url to download if it exists.