Remove Subversion-specific keywords (WOCommon, 54b91bb)

Created 7/20/2007, updated 3/5/2024

snippets

Remove $now-redundant $Id$ tags for all files; these were specific to Subversion and are no longer useful now that the code is being managed in a Git repository.

Signed-off-by: Greg Hurrell <greg@hurrell.net>