add extended line cap configuration

Pilz.UI/PaintingControl/DefaultLineCapProps.vb

@@ -0,0 +1,13 @@
+Imports System.Drawing.Drawing2D
+
+Public Class DefaultLineCapProps
+    Inherits LineCapProps
+
+    Public Property LineCap As LineCap = LineCap.Flat
+    Public Property CustomLineCap As CustomLineCap = Nothing
+
+    Friend Overrides Function Configure() As LineCapConfigurationArgs
+        Return New LineCapConfigurationArgs(LineCap, CustomLineCap)
+    End Function
+
+End Class