Added all-buildings layer
Related to https://git.gfz-potsdam.de/dynamicexposure/collaboration/-/issues/46
URL for the layer: https://tiles.openbuildingmap.org/all-buildings/{z}/{x}/{y}.png
\approve @ds
Edited by Felix Delattre
Related to https://git.gfz-potsdam.de/dynamicexposure/collaboration/-/issues/46
URL for the layer: https://tiles.openbuildingmap.org/all-buildings/{z}/{x}/{y}.png
\approve @ds