Add WMS map source

[jonskoglund]

Is it possible to add a WMS as a map source. I regularly use maps from WMS sources so it would be nice to show trails on those maps in Wanderer. Example:

WMS URL: https://cartoweb.wms.ngi.be/service?request=GetCapabilities&service=WMS&version=1.3.0
More info: https://www.geo.be/catalog/details/0fdbe090-bd35-41b1-8835-823eb769eaee?l=nl