v1.22.190829 Fixits, model_typecode

Please download from X-Plane.org.

• ADDED #44 lookup of a/c type designator by human-readable model text. Can avoid using standard A320/follow-me car in many, though not all cases.
  Many thanks to @crbascott for providing the mapping file model_typecode.txt, which you need to place into LiveTraffic/Resources.
• 2 changes to LTAPI for other plugins' benefit:
  • ADDED TwinFan/LTAPI#2 CSL model in use
  • CHANGED TwinFan/LTAPI#3 precision of location from float to double.