FIX: Heading True no longer uses Heading Continuous as a fallback as it is magnetic and not in the range of 0-360.
FIX: Landing Runway can operate with ILS Frequency During Approach but cannot operate if no Approach and Landing.
FIX: derived parameters which can use either True or Magnetic Headings standardised to only compute using same types of heading.
Merge branch 'master' of https://github.com/FlightDataServices/FlightDataAnalyzer