Replace menu mp3 with osz

Includes timing information necessary for beat syncing.

osu.Game.Resources/osu.Game.Resources.csproj

@@ -92,9 +92,6 @@
   <ItemGroup>
     <EmbeddedResource Include="Textures\Menu\background.jpg" />
   </ItemGroup>
-  <ItemGroup>
-    <EmbeddedResource Include="Tracks\circles.mp3" />
-  </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Textures\Backgrounds\bg3.jpg" />
   </ItemGroup>
@@ -631,6 +628,9 @@
   <ItemGroup>
     <EmbeddedResource Include="Fonts\Venera-Light_0.png" />
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Tracks\circles.osz" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
        Other similar extension points exist, see Microsoft.Common.targets.