Integrate Batoid for optical raytracing

[cwwalter]

This issue tracks the integration of @jmeyers314 's Batoid raytracing code with imsim.

Here we list important effects that we should be able to now implement.

• Vignetting
• Diffraction Spikes from Spider
• Ghosts and scattered light.

[cwwalter]

Noting that @jmeyers314 now has started external python controlled code (batoid) that does this.

[cwwalter]

Added list of optical effects we hope to simulate with Batoid to the main issue post. For now these don't have their own issues, but let's track desired functionality here.