Allow preprocessors to pass generated resources (fix issue #1087) #1341
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The problem it solves (#1087) is that some preprocessors actually generate files that need to be staged somewhere. I used to copy them directly to the book output dir, but the HBS rederer now removes the book output dir after the preprocessor has been executed (introduced with #985). Apart from that, copying the files to the book output dir will probably only work for the HBS renderer.
To overcome the above problem I have added a resource list to the Chapter struct. Renderers can read the extra resource data from there and process it as they see fit.
I do think the handles_book_resources test (hbs_renderer.rs:1131) may be a bit brittle. The render function does not really lend it self for unit testing.