Added further properties to AprsMessage to get aircraft type, address type and stealth mode, etc.#8

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pschuler78 wants to merge 3 commits intoskyhop:masterfrom

flightlog:master

Commits on Oct 8, 2021

Updated projects to use .net core 3.1 instead unsupported EOL 2.0 version
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Commits on Oct 9, 2021

Added AddressType, AircraftType, StealthMode and NotrackingFlag properties to AprsMessage
pschuler78
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Removed catch variable Exception from empty handling
pschuler78
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