allow using the Apple Maps public transport map

[derhuerst]

Thanks for the app, I like it a lot!

I often use it to record shapes of long-distance public transport journeys, in order to eventually contribute them to projects like Transitous.

I'd like to be able to use the public transport map as a background, just like in the Apple Maps app.

What do you think?

[vincentneo]

Unfortunately, the public transport map style isn't available for third party developers