Add support for no-boil (aka raw ale) recipes

[matty0ung]

As part of the work to add support for BeerJSON, we will have data structures that support no-boil brews (see https://byo.com/article/raw-ale/). Initially, although we'll be able to read in such recipes, the software won't handle them 100% correctly as there are a fair few places in the code and the UI where we assume there will be a boil. At some point, after BeerJSON support is released, we should come back and have a look at these to allow full support for no-boil recipes.