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Configure and use isort 😍
This should, eventually (with e.g. instructions in the contribution section, CI, etc.) make it easier to contribute to refex without breaking any style things. It also resolves a bunch of bad imports that are bad for various reasons (e.g. not moving the raw_ast import when it was renamed to ast_matchers, or stuff about whether typing is a third-party library, or...)
Pretty much everything looks good. Humongous thanks to @timothycrosley and everyone on isort issue #1486.
This also lets me ignore the internal linter that keeps bugging me about where refex imports go. One would imagine they should go in the first-party section -- internal linter doesn't agree (for reasons described in that issue), but it's hard to standardize on a lint-unfriendly order without some tool like isort to help back me up.