Improve Error handling across the board

MultiTool.Common/Exceptions.vb

@@ -57,18 +57,12 @@
             MyBase.New(message)
         End Sub
     End Class
-    Public Class NoMandatorException
+
+    Public Class LengthExceededException
         Inherits MultiToolException
 
-        Public Sub New(message As String)
-            MyBase.New(message)
-        End Sub
-    End Class
-    Public Class MalformedXmlException
-        Inherits MultiToolException
-
-        Public Sub New(message As String)
-            MyBase.New(message)
+        Public Sub New(attribute As String)
+            MyBase.New(attribute)
         End Sub
     End Class