Telemetry logging

[krishnans2006]

Rethink telemetry logging:

• Current (time;json) vs alternative formats
• Possibility of encoding for reduced filesize

Design GUI to view logs properly:

• Time scrolling and min/max limits to form a timeline and snapshots of specific points
• 3D view of path (or multiple 2D planes, ideally both)
• Smart features
  • Determine setup, taxi, takeoff, manual flight, autonomous flight, and landing sections of a flight
• Export of important data
  • Min/max/avg turn radius
  • Min/max/avg flight/ground speed across different flight sections
  • Min/max/avg altitude (AGL & MSL)
  • Total distance flown
  • etc.
• Reasonably fast
• Intuitive to use

[krishnans2006]

This has been resolved by #163.