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nmea: Add support for GGA messages from more NMEA sources

Based on patch from Daniel Aleksandersen code@daniel.priv.no
Expands GPS specific GGA test with tests for GGA messages from other
well-known Talker IDs in NMEA 4.1 including Galieo, BeiDou, GLONASS,
and GNSS (generic/mixed source mode).
GGA messages use the same format regardless of the Talker ID.

  • Improves device and GNSS network support.
  • Improves accuracy for users in Europe, Russia, China, and elsewhere.
  • Resolves compatibility problem with GPS devices that only report in
    GNGGA and not GPGGA even in single-network mode.

Fixes:#60 (closed)

Edited by Iqbal Inzamam

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