Add additional telemetry mode for improved mavlink support. Use modified version of FastSerial to replace stock arduino serial port
Merge https://github.com/gitsly/openLRSng into gitsly
Merge commit '0bd55354e67860ba8e8bfbb21e54fa1f43ed8765' into development

# By Martin
# Via Martin (1) and kh4 (1)
* commit '0bd55354e67860ba8e8bfbb21e54fa1f43ed8765':
  Add additional telemetry mode for improved mavlink support. Use modified version of FastSerial to replace stock arduino serial port