Add additional logging functionality

VocaluxeLib/IBasic.cs

@@ -152,7 +152,7 @@ namespace VocaluxeLib
 
     public interface ILog
     {
-        void LogError(string errorText);
+        void LogError(string errorText, bool showMsg = false, bool exit = false);
         void LogDebug(string text);
         void LogSongInfo(string text);
     }

VocaluxeLib/Menu/CStatic.cs

@@ -16,7 +16,6 @@
 #endregion
 
 using System;
-using System.Drawing;
 using System.Xml;
 using VocaluxeLib.Draw;