Use a Manifest to provide information of the app

[senakafdo]

Currently, the app landing page displays a link to the app-specific controller, which may not exist for all apps, which is a bug. But, beyond that, the landing page also computes appName and appId on the client side, the version number is provided using a regex replacement and so forth.

Instead of this kind of messy model of retrieving app-specific information, it would be better to have an app-specific Manifest which has this kind of information, which can then be interpreted by the landing page, UIs, SDKs etc, which will be a much cleaner implementation.