Add additional logging functionality

Vocaluxe/Base/CMain.cs

@@ -434,9 +434,9 @@ namespace Vocaluxe.Base
 
     class CBlog : ILog
     {
-        public void LogError(string errorText)
+        public void LogError(string errorText, bool showMsg = false, bool exit = false)
         {
-            CLog.LogError(errorText);
+            CLog.LogError(errorText, showMsg, exit);
         }
 
         public void LogDebug(string text)

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;