Pebble: fix new app manager on 2.x

- properly intert apps reported from pebble into the corresponding tab
- disable tracking of installed apps
- disable drag and drop for apps and watchfaces
- ...

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/PebbleUtils.java

@@ -29,4 +29,8 @@ public class PebbleUtils {
         }
         return model;
     }
+
+    public static int getFwMajor(String fwString) {
+        return fwString.charAt(1) - 48;
+    }
 }