Allow removal of incompatible apps

Created by: UniversalSuperBox

Apps which are not in the user's current channel are currently not shown in the store. This is a problem for scopes, which offer no way to be uninstalled through the UT interface.

This commit shows all apps installed on the device on the "installed apps" page. It also adds a "Remove" option for apps which are not compatible. Pressing the "Remove" button confirms that you want to remove the app, removes the app, then closes the page.