Add a variety of 3D and 2D canonical solids and shapes for rendering

[lnihlen]

Rectangular prisms, spheres, cylinder/cone on the 3D side, plus circles, triangles, arbitrary closed concave polygons on the 2D side.

[lnihlen]

And of course we can't forget the Utah teapot, should be pretty easy to extract the teapot .obj into a vertex/index array and compile in