Create unit test render, need to validate the lenses about lentil

[zpelgrims]

Validation needs to include:

• quick to render shaders (no sss...)
• measure of focal length
• measure of focus distance
• contrast in both axis to validate abberations
• clearly see bokeh shapes
• be pretty

[zpelgrims]

This will be necessary for the website previews.

• Write script that loops through lenses, renders them and outputs them to correct image names

After the scrape I'll also need to write this as an extra step upon automatic lens creation

@kadenzipfel fyi this is for #126

[zpelgrims]

alter:

• more "scientific" test image
• add denoise? first try on an image before implementing
• needs to fit design of website

[zpelgrims]

all the code has been set up
now just need to install linux at home so I can batch run the renders

[zpelgrims]

Todo:

• chain openimageio conversion to png
• use bidirectional sampling setup in each render

[zpelgrims]

done, now need to create all the lenses etc first, then run this!