Implement ishidden on all providers #271
Description
Leaflet and esri have a marker ishidden property, so implememnet this on all providers (including the empty one) and make it part of the core tests. Also add it to polyline too.
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Leaflet and esri have a marker ishidden property, so implememnet this on all providers (including the empty one) and make it part of the core tests. Also add it to polyline too.