Added preview-player which is used for playing preview in song-menu.

VocaluxeLib/VocaluxeLib.csproj

@@ -135,6 +135,7 @@
     <Compile Include="PartyModes\IPartyMode.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Utils\CWavFile.cs" />
+    <Compile Include="Utils\Player\CPreviewPlayer.cs" />
     <Compile Include="Utils\Player\CSongPlayer.cs" />
     <Compile Include="Utils\Player\CSoundPlayer.cs" />
   </ItemGroup>