v3.4.0 Airline Mapping, Reworked Multicast

• Added #64 airline mapping in new file relOp.txt, which allows to use same liveries for subsidaries of mother airline companies, like using EIN (Aer Lingus Ireland) liveries for EUK (Aer Lingus UK) flights.
• Fixed #65 using all network interfaces for remote functionality. Also supports IPv6 now. For this to work perfectly both master (the plugins sending data) as well as the Remote Client need to be updates.
• Added more options to the optional XPMP2.prf configuration file, see Resources/XPMP2.example.prf for documentation.
  • remoteSendIntf to set the multicast send interface for remote functionality
  • overrideLabelsDraw and overrideTCAS_Control to override display of labels and control of TCAS/AI
• Updated Github Actions for checkin/out to latest and madatory v4, unfortunately requiring separate artifact files per platform