Update campaign settings

Save an Experience campaign's settings in place, all or nothing: its name, devices and customers, from the next cycle planned; results continue on the same campaign and take in the change over its next 30 days. Every new cycle uses each customer's newest version, so customerVersionPolicy latest changes nothing and pinned is refused. Its websites, pages, platform, access and mode never change, and an always-on campaign has no schedule to change: each listed customer shops once every UTC month. Nothing is charged at Save: delivered visits accrue against the plan. Pass expectedSettingsRevision from experience_campaign_settings_get; a Save whose settings moved since is refused (STALE_WRITE). Pass reviewedEstimate from experience_campaign_settings_quotes_get to also refuse one whose estimate moved, or null to save at the current estimate. A person confirms it.