revert to VB and update to new project file format

Pilz.Collections/SimpleHistory/ObjectBase.vb

@@ -0,0 +1,13 @@
+Namespace SimpleHistory
+
+    Public Class ObjectBase
+
+        Public Shared Property DefaultPriorityValue As Integer = 1000
+
+        Public Property UndoPriority As Integer = DefaultPriorityValue
+        Public Property RedoPriority As Integer = DefaultPriorityValue
+
+    End Class
+
+
+End Namespace