190607 c1

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

Pilz.Simple3DFileParser/Model/Point.vb

@@ -0,0 +1,6 @@
+Public Class Point
+    Public Property Vertex As Vertex = Nothing
+    Public Property UV As UV = Nothing
+    Public Property VertexColor As VertexColor = Nothing
+    Public Property Normal As Normal = Nothing
+End Class