Add Option to also update available installed apps Merged

As with Scappman, please enable the option that when an available app is installed by a user, this app is automatically updated when a new update is released.
Currently, new versions are released and the stored groups are added to the new versions, but there is no automatic update.
For Scappman, this was covered in the KB article: https://support.scappman.com/applications/how-scappman-keeps-your-available-apps-up-to-date