v0.9.1a: more android lifecycle adjustments, should fix various bugs

SPD-classes/src/main/java/com/watabou/noosa/Game.java

@@ -141,6 +141,12 @@ public class Game implements ApplicationListener {
 	
 	@Override
 	public void render() {
+		//prevents weird rare cases where the app is running twice
+		if (instance != this){
+			finish();
+			return;
+		}
+
 		NoosaScript.get().resetCamera();
 		NoosaScriptNoLighting.get().resetCamera();
 		Gdx.gl.glDisable(Gdx.gl.GL_SCISSOR_TEST);

android/src/main/AndroidManifest.xml

@@ -40,7 +40,7 @@
 			android:label="${appName}"
 			android:name=".AndroidGame"
 			android:screenOrientation="nosensor"
-			android:configChanges="keyboard|keyboardHidden|orientation">
+			android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout|smallestScreenSize">
 		</activity>
 
 	</application>

android/src/main/java/com/shatteredpixel/shatteredpixeldungeon/android/AndroidGame.java

@@ -124,17 +124,6 @@ public class AndroidGame extends AndroidApplication {
 		super.onResume();
 	}
 
-	@Override
-	protected void onDestroy() {
-		//LibGDX itself doesn't clear these in every case, so we do it ourselves to be sure
-		graphics.clearManagedCaches();
-		audio.dispose();
-		if (instance == this) {
-			instance = null;
-		}
-		super.onDestroy();
-	}
-
 	@Override
 	public void onBackPressed() {
 		//do nothing, game should catch all back presses