add extended line cap configuration

Pilz.UI/PaintingControl/ArrowLineCapProps.vb

@@ -0,0 +1,15 @@
+Imports System.Drawing
+Imports System.Drawing.Drawing2D
+
+Public Class ArrowLineCapProps
+    Inherits LineCapProps
+
+    Public Property Size As New Size(10, 10)
+    Public Property IsFilles As Boolean = True
+
+    Friend Overrides Function Configure() As LineCapConfigurationArgs
+        Dim cap As New AdjustableArrowCap(Size.Width, Size.Height, IsFilles)
+        Return New LineCapConfigurationArgs(cap)
+    End Function
+
+End Class