Update to .NET Standard 2.0#291

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jhancock4d wants to merge 5 commits intoAuthorizeNet:masterfrom

jhancock4d:master

Commits on Dec 8, 2021

.netstandard 2.0 initial migration
James Hancock
committed
Migration to .net standard 2.0
James Hancock
committed
Fix credentials
James Hancock
committed
Mostly fix Java developer writting C# code naming violations, using statements in wrong places, etc.
James Hancock
committed
Fix keys again.
James Hancock
committed