revert to VB and update to new project file format

Pilz.Configuration/SettingsBase.vb

@@ -0,0 +1,20 @@
+Imports Newtonsoft.Json
+
+Public MustInherit Class SettingsBase
+
+    Public Sub New()
+        ResetValues()
+    End Sub
+
+    <JsonIgnore>
+    Friend _settingsManager As ISettingsManager
+    <JsonIgnore>
+    Public ReadOnly Property SettingsManager As ISettingsManager
+        Get
+            Return _settingsManager
+        End Get
+    End Property
+
+    Public MustOverride Sub ResetValues()
+
+End Class