add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/OpenGLWindow/Shaders/linesPS.glsl

@@ -0,0 +1,10 @@
+
+#version 150
+
+in vec4 colourV;
+out vec4 fragColour;
+
+void main(void)
+{
+    fragColour = colourV;
+}