mvmSiteBuilder 1.3.0: Put another app's page in your site

A licensed mvmSiteBuilder can now place another app's public page into a site as a block, so a Budget summary or a QueueDesk queue appears on a page you built instead of only at its own address. The list of apps offering one comes from the app-to-app API, so an app becomes available as a block simply by being installed and enabled. The text block now runs through a rich-text sanitiser instead of plain escaping, so formatting survives editing. mvmSiteBuilder moves from Creative to Developer Tools. QueueDesk 1.2.0 adds two switches of its own: one to publish its public page as a site widget for mvmSiteBuilder, and one to turn its own direct public page on and off.