Add MKMapview with vehicle locations

[luqmaan]

_t_Issue https://github.com/luqmaan/MetroRappid/issues/3

[luqmaan]

Need to fix:

• [x] The toggled order bug is happening again
• [x] The third arrival cell is cut off
• [x] How do I dequeue the cells without killing memory/allocating each time there is a scroll?

[luqmaan]

:goat: