Simulated routing via GPX trace

1. Push GPX trace file to SD card using `adb push filename.gpx /sdcard/filename.gpx`
2. Launch app and reveal debug settings by searching for "yo!!!".
3. Enable "GPX trace mode" and configure GPX file name in settings menu.
4. Search for the same destination from the GPX trace file and start routing mode.
5. Profit!

Once routing mode begins mock locations from the GPX trace will automatically be broadcast by the location client.