Recipe Specs: Second Iteration

[mvahowe]

This PR claims to be progress on the first iteration. (The PR is against that first iteration, not develop, let alone master.)

I've reworked the grammar so that most things are list. This is a little less explicit but massively more compact.

I've also produced three realistic examples:

• a short identity transform: https://github.com/bible-technology/scripture-burrito/blob/mvh/recipe_specs_as_arrays/docs/examples/artifacts/ingredients/recipe_spec/identity_variant.json

• a long and explicit identity transform: https://github.com/bible-technology/scripture-burrito/blob/mvh/recipe_specs_as_arrays/docs/examples/artifacts/ingredients/recipe_spec/explicit_identity_variant.json

• a recipe for a derived audio entry including ingredient processing: https://github.com/bible-technology/scripture-burrito/blob/mvh/recipe_specs_as_arrays/docs/examples/artifacts/ingredients/recipe_spec/audio_wav_to_mp3.json

[mvahowe]

Merging this to the "not even develop" branch for safekeeping.