Remove unused imports

Vocaluxe/Lib/Sound/Playback/GstreamerSharp/CGstreamerSharpAudio.cs

@@ -15,7 +15,6 @@
 // along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
 #endregion
 
-using System.Collections.Generic;
 using Gst;
 
 namespace Vocaluxe.Lib.Sound.Playback.GstreamerSharp

Vocaluxe/Lib/Sound/Playback/OpenAL/COpenALPlay.cs

@@ -15,11 +15,7 @@
 // along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
 #endregion
 
-using System.Linq;
-using System.Threading;
 using OpenTK.Audio;
-using System;
-using System.Collections.Generic;
 
 namespace Vocaluxe.Lib.Sound.Playback.OpenAL
 {