Some code cleanup

Vocaluxe/Base/CBackgroundMusic.cs

@@ -31,22 +31,14 @@ namespace Vocaluxe.Base
 
         public static void Init()
         {
-            foreach(string path in Helper.ListFiles(CSettings.sFolderBackgroundMusic, "*.mp3", true, true))
+            List<string> templist = new List<string>();
+
+            foreach(string ending in CSettings.MusicFileTypes)
             {
-                _BGMusicFileNames.Add(new PlaylistElement(path));
+                templist.AddRange(Helper.ListFiles(CSettings.sFolderBackgroundMusic, ending, true, true));
             }
 
-            foreach(string path in Helper.ListFiles(CSettings.sFolderBackgroundMusic, "*.ogg", true, true))
-            {
-                _BGMusicFileNames.Add(new PlaylistElement(path));
-            }
-
-            foreach(string path in Helper.ListFiles(CSettings.sFolderBackgroundMusic, "*.wma", true, true))
-            {
-                _BGMusicFileNames.Add(new PlaylistElement(path));
-            }
-
-            foreach(string path in Helper.ListFiles(CSettings.sFolderBackgroundMusic, "*.wav", true, true))
+            foreach (string path in templist)
             {
                 _BGMusicFileNames.Add(new PlaylistElement(path));
             }

Vocaluxe/Base/CSettings.cs

@@ -111,6 +111,11 @@ namespace Vocaluxe.Base
         public static bool TabNavigation = false;
 
         public const float BackgroundMusicFadeTime = 0.5f;
+
+        public static List<string> MusicFileTypes = new List<string>()
+        { 
+            "*.mp3","*.wma","*.ogg","*.wav" 
+        };
         
         public static string GetVersionText()
         {