Allow the `configuration` field of a pipe in a pipeline yaml file to be
of any type. When constructing the pipe object, the object will be
re-serialized via `yaml.dump` before being passed to the constructor.
Now pype has an `autocomplete` command usable to enable autocompletion
and revng2 now is based on `pype`, modifying its defalults and
injecting new commands.
Giacomo Vercesi