How-to add decluttering to a vector layer

Decluttering is offered by OpenLayers and will create less crowded maps by not rendering features which overlap. As of GeoMoose 3.8.0, this is turned off by default. To restore decluttering, add it as a <config> to the <map-source>.

<map-source ...>
    <config name="declutter" value="true" />
</map-source>