Include directory management in the report libraries

So is perhaps beyond the scope of the revised report but I really feel that directory management should be part of the report. It's the bare minimum of what you would expect of a programming language to have and is very FFI heavy. Perfect for what you require implementors to implement.

Right now, I'm keen to include all of `System.FilePath` and a subset of `System.Directory`. With `System.Directory` there are functions that depend on `time` so those have a reasonable case to be excluded.

Start by reviewing the revised report's library coverage and the proposed System.FilePath and System.Directory modules. Identify the System.Directory functions that depend on time and compare them with the intended report scope. Done means the report has a resolved directory-management scope and the selected APIs are incorporated consistently.

Written by the indexing model from the issue text.