Split out rope a bit more until it's stable

[gatesn]

I've seen quite a few issues from the rope implementation. Probably going to revert / disable it by default.

Will keep pre-loading some known large modules, perhaps in another thread, in order to warm up Jedi. Also going to remove pluggy racing, since Jedi's cache isn't thread safe.

[lgeiger]

👍for disabling rope by default until it's safe to use.