uSync.Complete: Umbraco 17.8 readiness fixes

uSync.Complete: Publisher matches the current server on host, port and path, ignoring scheme and case, so it still matches when 17.8 upgrades the application URL to https after the first request
uSync.Complete: moved the Restore points page body into a workspace view (the workspace editor's default slot is deprecated in 17.8)
uSync.Complete: Push, Pull and Add to Sync Queue grouped with the new entity action separatorBefore
uSync.Complete: push no longer goes ahead with the old version when save and publish is cancelled at the variant picker
Merged all four into v17/17.6.0 for the next release