Now the pype command has a `--verbose` argument that to enable debug
logging in the pypelien code.
Adapted the codebase to use this new logging format but replacing
`logging` with `revng.pypeline.utils.logger`, this is done in
preparation of debug-log.
Now pype has an `autocomplete` command usable to enable autocompletion
and revng2 now is based on `pype`, modifying its defalults and
injecting new commands.
When click calls the command handler functions, dashes are converted to
underscores to work with the variable name limitations of python. When
accessing kwargs, convert the argument name to the underscored version.
Tommaso Fontana