Feature Request: Simple example that creates all the Graphics Items (2D and 3D) in Code

[jerryepratt]

It would be nice to have a simple example (which also doubles as a manual test case) of all the different graphics items that can be created and displayed from code. Some of them are hard to figure out, register, etc. And some seem to not be working or not supported in code (like some of the 2D plotter panel objects.) Sometimes writing them in software is preferable to creating them in the GUI. So almost everything that can be done in the GUI should also be doable in code, with graphic items added to the YoGraphicsListRegistry or some other way to register them.