* open-api-explorer engine with embedded swagger-ui

* move swagger config to a component, rely directly on swagger-ui

* filter operations by endpoint, hook up filter to query param, add namespace handling

* fix namespace handling

* update ember-engines so that we can app.import in a lazy engine

* use engine's included hook to move swagger-ui to engine-vendor.* files

* show flash message about this being a live vault server

* show a namespace reminder and override some styles from swagger-ui

* switch filter to use includes instead of startsWith

* move flash-message to alert-banner and fix namespace reminder with a block

* adds explore web-cli command to navigate to the api-explorer engine

* allow passing a preformatted string to flash messages

* add multi-line flash-message to api explorer

* invert control and trigger events on react app so we can control the layout more and use our components

* tweak styling some more and adj...