Support for mixed mode for apps with embedded artifacts and still needing updates from the cloud

[kmahmood74]

The best way to get fast load times is to embed all the app artifacts such as screen, theme, widget definitions etc inside the app bundle. We support that already with the local definition inside ensembleConfig.yaml. However doing that eliminates the possibility of updating the app without having to update the full binary.

What's needed is a mixed mode where the initial binaries may be embedded in the app bundle but the framework still checks the ensemble/remote provider for updates and gets the latest if the files have changed. It then stores the files in the persistent storage to guarantee fast load times on every launch.