Logging component

[spernsteiner]

The logging component should receive telemetry from the autopilot via MAVLink and log some of the values (such as current GPS position) to disk.

[spernsteiner]

From in-person discussion with @podhrmic:

• The logging component should connect to the autopilot telemetry port and record some or all telemetry values to disk.
• Logs should be saved in text format, with a timestamp on each line.
• Logs will be encrypted by storing them on an encrypted filesystem (exact filesystem type TBD). The key for the encrypted filesystem will be obtained from the Mission Key Management component ([FEATURE] Implement Mission Key Management (MKM) component  #98). The filesystem should be initialized on first use if possible.