Added initial gstreamer audio playback.

x86 might not work due to misconfiguration because I could not test it since acinerella is broken in x86 currenty. Gstreamer video support is yet to follow.
Please report back any bugs you experience. To compile you will need Visual C++, I hope all files are included

VocaluxeLib/Menu/IMenu.cs

@@ -637,7 +637,8 @@ namespace Vocaluxe.Menu
     public enum EPlaybackLib
     {
         PortAudio,
-        OpenAL
+        OpenAL,
+        Gstreamer
     }
 
     public enum EWebcamLib

VocaluxeLib/Menu/SongMenu/CSongMenuFramework.cs

@@ -649,8 +649,8 @@ namespace Vocaluxe.Menu.SongMenu
                 if (startposition == 0f)
                     startposition = _Base.Sound.GetLength(_stream) / 4f;
 
-                _Base.Sound.SetPosition(_stream, startposition);
                 _Base.Sound.Play(_stream);
+                _Base.Sound.SetPosition(_stream, startposition);
                 _Base.Sound.Fade(_stream, 100f, 3f);
                 _streams.Add(_stream);
                 _actsongstream = _stream;