fixed party mode xml reading, added compiler code, added challenge game mode files (just a first test)

Vocaluxe/Base/CSettings.cs

@@ -90,7 +90,10 @@ namespace Vocaluxe.Base
         public const string sFolderScreenshots = "Screenshots";
         public const string sFolderBackgroundMusic = "BackgroundMusic";
         public static string sFolderPlaylists = "Playlists";
+
+
         public static string sFolderPartyModes = "PartyModes";
+        public const string sFolderPartyModeCode = "Code";
 
         //public const String[] ToneStrings = new String[]{ "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B" };
         public const int ToneMin = -36;