macOS Sonoma 14.1 and iScreensaver 6.8.6 fixes

Changes in iScreensaver v6.8.6 have been fully verified under both Sonoma 14.0 and 14.1, for M-series and Intel-based Macs. We encourage all iScreensaver Designer v6 developers to upgrade and re-build their Mac installers for all of their Sonoma end-users.