The source project of this merge request has been removed.
Download tiles from WMS (Web Map Service) servers
Add a new ChamplainNetworkWmsTileSource type which is identical to ChamplainNetworkTileSource except its URI format takes four numbers which define a bounding box, rather than the XYZ convention used by ChamplainNetworkTileSource.
See: https://www.opengeospatial.org/standards/wms for more information about WMS and https://www.bgs.ac.uk/data/services/digmap50wms.html for an example of a WMS.