Prevent screen rotation or resize from destroying activities

If the screen is rotated by default Android destroys the
activity and recreates it. This causes issues if a child and
parent are already paired, as the connection is lost.

To prevent Android from destroying the Activity, instead
invoke a configuration change on an orientation or resize.

AndroidManifest.xml

@@ -18,6 +18,7 @@
         <activity
             android:name="protect.babymonitor.StartActivity"
             android:label="@string/app_name"
+            android:configChanges="orientation|screenSize"
             >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -27,16 +28,19 @@
         <activity
             android:name="protect.babymonitor.MonitorActivity"
             android:label="@string/app_name"
+            android:configChanges="orientation|screenSize"
             android:parentActivityName="protect.babymonitor.StartActivity"
             />
         <activity
             android:name="protect.babymonitor.DiscoverActivity"
             android:label="@string/app_name"
+            android:configChanges="orientation|screenSize"
             android:parentActivityName="protect.babymonitor.StartActivity"
             />
         <activity
             android:name="protect.babymonitor.ListenActivity"
             android:label="@string/app_name"
+            android:configChanges="orientation|screenSize"
             android:parentActivityName="protect.babymonitor.DiscoverActivity"
             />
     </application>