Fix bugs in Setting screen & add a way to exit without saving

Source/Android/app/src/main/res/layout/fragment_grid.xml

@@ -11,5 +11,5 @@
         android:layout_height="match_parent"
         android:layout_marginLeft="@dimen/activity_horizontal_margin"
         android:layout_marginRight="@dimen/activity_horizontal_margin"
-        tools:listitem="@layout/grid_card_game"/>
+        tools:listitem="@layout/card_game"/>
 </FrameLayout>

Source/Android/app/src/main/res/menu/menu_add_directory.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android">
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
     <!-- TODO Please give me an icon! -->
     <item
         android:id="@+id/menu_up_one_level"
         android:title="@string/add_directory_up_one_level"
-        android:showAsAction="ifRoom|withText"/>
+        app:showAsAction="ifRoom|withText"/>
 </menu>

Source/Android/app/src/main/res/menu/menu_settings.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/menu_exit_no_save"
+        android:title="@string/preferences_exit_no_save"
+        android:icon="@drawable/ic_cancel"
+        app:showAsAction="ifRoom"/>
+</menu>

Source/Android/app/src/main/res/values/strings.xml

@@ -327,6 +327,7 @@
     <string name="add_directory_empty_folder">That folder is empty.</string>
 
     <!-- Preferences Screen -->
+    <string name="preferences_exit_no_save">Exit Without Saving</string>
     <string name="preferences_cpu">CPU Settings</string>
     <string name="preferences_input">Input Settings</string>
     <string name="preferences_extensions">Extension Bindings</string>