Removed navigation in Library

Having navigation in Library makes it hard to have options for each fragments we have to add manualy to each fragment

app/src/main/java/code/name/monkey/retromusic/interfaces/MainActivityFragmentCallbacks.kt

@@ -11,14 +11,11 @@
  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  * See the GNU General Public License for more details.
  */
-
 package code.name.monkey.retromusic.interfaces
 
 /**
  * Created by hemanths on 14/08/17.
  */
-
-interface MainActivityFragmentCallbacks {
-
+internal interface MainActivityFragmentCallbacks {
     fun handleBackPress(): Boolean
-}
+}