Introduce Protocol.h to use defines instead of protocol characters

When Who What
2023-08-25 19:59:56 Peter Eisentraut (petere) Closed in commitfest 2023-09 with status: Committed
2023-08-25 19:59:56 Peter Eisentraut (petere) Changed committer to bossartn
2023-08-25 19:59:45 Peter Eisentraut (petere) Changed authors to Dave Cramer (dcramer)
2023-08-25 19:59:45 Peter Eisentraut (petere) Changed targetversion to 17
2023-08-03 17:48:36 Dave Cramer (dcramer) Changed targetversion to 16
2023-08-03 17:48:06 Dave Cramer (dcramer) Attached mail thread CADK3HHKbBmK-PKf1bPNFoMC+oBt+pD9PH8h5nvmBQskEHm-Ehw@mail.gmail.com
2023-08-03 17:48:05 Dave Cramer (dcramer) Created patch record