Update copyright years to include 2023
Spelling fixes. Fix #13357
Update the Copyright year of the files owned by Rubicon/Netgate.
Update the Copyright year.
A subsequent commit will deal with .po's.
This is 2020. Issue #9245
Update copyright notice years. Issue #9245
Fix copyright message years to reflect BSDP -> ESF -> Netgate
Add README.txt for issue #9104
Make sure core packages are built with proper ABI information
Use already defined variable
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