Added in "ModeFromString" for turning standard serial port mode notat…#151

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AndreRenaud wants to merge 4 commits intobugst:masterfrom AndreRenaud:mode_from_string

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Commits on Dec 22, 2022

Added in "ModeFromString" for turning standard serial port mode notation into the Mode structure
AndreRenaud
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Move to populate an existing structure, which makes applying other settings easier
AndreRenaud
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Commits on Jan 8, 2023

Fix up error testing - errors.Is didn't match properly
AndreRenaud
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Commits on Jan 31, 2023

Simplify test error checking
AndreRenaud
committed