[Feature Request]: Add map layers like basemap to the game

[Cr4zyc4k3]

Is your feature request related to a problem? Nope

Solution / Feature Modify the leaflet layer control to add more maps like https://basemap.de/, https://gdz.bkg.bund.de/index.php/default/webdienste/topplus-produkte/wms-topplusopen-wms-topplus-open.html or http://www.openfiremap.de/

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