[Android] Add a button in the emulation view that allows a person to exit emulation and go back to the game list.

However, this does not work correctly yet. It will stop correctly. But the SurfaceView will not render the next game selected.

Source/Android/res/values-ja/strings.xml

@@ -33,6 +33,7 @@
     <!-- Emulation Window Overlay -->
     <string name="overlay_savestate">ステートセーブ</string>
     <string name="overlay_loadstate">ステートロード</string>
+    <string name="overlay_exit_emulation">終了</string>
     <string name="overlay_slot1">スロット 1</string>
     <string name="overlay_slot2">スロット 2</string>
     <string name="overlay_slot3">スロット 3</string>