Modularize base.py for readability

[keyan]

This is downstream of #89

Partially addresses #64. Though I think things can be much cleaner still, I didn't want to diverge too far without merging first.

The code is mostly the same, but individual classes have been moved into their own classes. Additionally, I created two "helper" modules that include general use functions. In order to avoid a circular dependency I removed the run_interactive method from the Query class and update the associated documentation.

[keyan]

@modocache any interest in this change? I'm happy to fix the merge conflicts if you plan on merging.

[modocache]

Yup, sorry! Please rebase and I'll merge, thanks.

[keyan]

@modocache no problem, I know this is a really hard one to review so I figured you might not have the bandwidth to accept it.

I rebased and fixed the conflicts with 08331ef and 162d234 manually by applying those changes to the respective modules terminal_helper.py and query.py.

[modocache]

Sweet, thanks! It's great to have this split up, maybe we can start adding unit tests soon. Awesooome!