Add Tab to see Departures from all stations nearby

[linuzzx]

Acknowledgments
Please check the following boxes with an x if they apply:

• [ x] The feature I want to propose would be useful for the majority of users, not only for me personally.
• [x ] I am aware that Transportr is mostly developed by one person in their unpaid spare time.
• I can help myself to get this feature implemented or know someone who wants to do it.
• If I want to add support for a new region or country, I checked that this is already available in public-transport-enabler and know the process described on the Transportr homepage.

Is your feature request related to a problem? Please describe.
If I want to see if I can catch the bus, I don't have time to search for the specific station

Describe the solution you'd like
A tab that shows nearby stations, like Öffi
Adding an option to mark favorite stations and show these at the top if they're nearby