Zh GoogleMap, new built-in map type

Hi there.

I’ve added OpenTopoMap map type, you can use it as map predefined type for map, and map override type in plugin too.

As for OpenStreetMap, this type you can enable in map details, just open it and set to Yes drop down list for OpenTopoMap.

In plugin you can pass OPENTOPOMAP as map type for plugin call (be sure it enabled for your map)