feature: Add maps of aircraft (Live + Static)

[flymia]

The live map feature is something that would boost the overall coolness of the project significantly.

I think we should add two maps:

• one live map, where the real time locations can be tracked if using an ACARS software. but this is the harder one, we need to think about the structure. which API calls should we use and how do we manage if two persons send the same aircraft location at the same time? we need some kind of blocking mechanism?
• a static map where every aircraft is plotted at the airport where it's currently located. maybe add this one first since we can do this with the data we already have at hand (Aircraft->current_loc).