Renamed project to "SkyLines"

without the "Tracker" suffix
Added black launch images

to be replaced with the real ones
MainViewController: Don't ping the server on startup
Storyboard: Updated layout
TrackingController: Use unconnected UDP sockets

see 7be0180 in the xcsoar repository
MainViewController: Adjusted label texts
Update controls when tracking is started
Set the tracking key every time the tracking is started
Fix tracking key variable size
Fix tracking key endianess
Make "SkyLines" a universal app
Added "Missing key" warning