Feature request: Open FlightMaps as map provider

[bergziege]

• As a sim maintainer I would like to configure map sources for avitab to add new map sources (example: OFM)

• As a pilot I would like to change the map provider of the online map in the tablet to show OFM charts for VFR flying.

The guys from open flightmaps seem to be very cooperative in providing links to use their map. And it sounds their map uses the same format as OpenTopo which is the current map provider. So there should be "no difficulties"(tm) in using OFM in the tab.

But you can use the EPGS tiles from OFM offline: Yes, I know. But they do not contain all information visible on the online map. Specially VFR patterns and routes.