190607 c1

- Add Pilz.Drawing.Drawing3D.OpenGLFactory
- Fix small bugs in Pilz.UI.PaintingControl

Pilz.Simple3DFileParser/Model/Face.vb

@@ -0,0 +1,5 @@
+Public Class Face
+    Public ReadOnly Property Points As New List(Of Point)
+    Public Property Material As Material = Nothing
+    Public Property Tag As Object = Nothing
+End Class