Eliminating the shared state between components

I have made a draft of how I think the 3D components could interact in a more organised and clean way than it was before. It relies on displaylists and opengl picking.

Objects now do not draw themselves directly. Instead, they compile their contents into a displaylist which then gets sent to the displayservice. This way the displayservice is able to draw the objects all at once and without being dependent on the linearised scheduling of all the components. A nice side effect is that displaylists also make things faster. For dynamic objects a component could recompile its displaylist every frame. I'm not sure how well this will work though.

Being able to draw the objects at any time and as often as needed, also enabled the use of picking for event processing. It works by defining a point (mouse position) and drawing the scene in GL_SELECT mode. All the objects which were drawn near the specified point can then be determined. The line/OOB intersection with every object is not needed anymore.

The draft is in my Sketches folder in 3D/playground/. A working example is included in the file SimpleCube.py. It shows that it works but it could not be less spectacular (cubes again).