added ability to set tag when pushing VC, added getter for VC container

src/main/java/ru/touchin/roboswag/components/navigation/viewcontrollers/ViewController.java

@@ -433,6 +433,10 @@ public abstract class ViewController<TActivity extends FragmentActivity, TState
             this.container = container;
         }
 
+        @Nullable
+        public ViewGroup getContainer() {
+            return container;
+        }
     }
 
 }

src/main/java/ru/touchin/roboswag/components/navigation/viewcontrollers/ViewControllerNavigation.kt

@@ -57,6 +57,7 @@ open class ViewControllerNavigation<TActivity : FragmentActivity>(
             viewControllerClass: Class<out ViewController<out TActivity, TState>>,
             state: TState,
             addToStack: Boolean = true,
+            backStackName: String? = null,
             transactionSetup: ((FragmentTransaction) -> Unit)? = null
     ) {
         addToStack(
@@ -65,7 +66,7 @@ open class ViewControllerNavigation<TActivity : FragmentActivity>(
                 0,
                 addToStack,
                 ViewControllerFragment.args(viewControllerClass, state),
-                null,
+                backStackName,
                 transactionSetup
         )
     }