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)