[code-quality] Jedi gets a new parser

Hi all! I will be writing a new parser for Jedi. This is necessary for a quite a few reasons described in: https://github.com/davidhalter/jedi/issues/480. I'm posting this here, because some of you may be interested in actually using the new parser. It's going to be pure Python and contrary to the Python's internal parser will have error recovery and indent positions. If you're interested, I'd be really glad to hear your feedback! ~ Dave