internal: Add a `fastpickle` module to help with multiprocess serialization. Looks like we're wasting a lot of time serializing custom class information for the workers, so this new module helps to convert classes to standard structures (dicts, lists, etc).

[pytest]
norecursedirs = .* _darcs CVS .svn .git .hg *.egg-info dist build node_modules venv tmp* {args}