SDL: fixed dark text on dark background in notification, updated Gradle files

project/AndroidManifestTemplate.xml

@@ -11,6 +11,8 @@
 				 android:banner="@drawable/banner"
 				 android:isGame="true"
 				 android:extractNativeLibs="true"
+				 android:supportsRtl="true"
+				 android:theme="@style/AppTheme"
 	>
 		<activity android:name=".MainActivity"
 				  android:label="@string/app_name"