v3.4.2 Fixes for XP 12.4.x

[TwinFan]

• Fixed potential crashes in X-Plane 12.4.1 due to stricter SDK validations.
• Fixed potential "Traffic plugin error...gave us target with no id" messages by XP 12.4.0.
• Fixed a memory overrun in networking, which had the potential of triggering crashes anywhere in X-Plane.
• Different transponder modes are derived and sent to X-Plane for consideration in their improved TCAS displays. Certainly depends on what the master sends.
  E.g. LiveTraffic sends for smaller aircraft (wake turbulence category L and L/M) "Mode C"; for larger ones "Mode S", and depending on location it further differentiates between "GND", "TA-Only", and "TA/TR" mode.