Manipulate Mac OS X pasteboards

Changes for 0.104 - 2023-12-19

• Return correct item ID. Thanks to DabeDotCom (Dabrien 'Dabe' Murphy) for the pull request.
• Fix fatal error when compiled under Xcode 15 or above The error was introduced when I cut out the pbl back-end, but was previously not fatal -- at least not usually. Thanks to Mike Cappella for finding this for me.
• No flavor tags in Monterey and forward.