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Summary:
Applies new import merging and sorting from µsort v1.0.

When merging imports, µsort will make a best-effort to move associated
comments to match merged elements, but there are known limitations due to
the diynamic nature of Python and developer tooling. These changes should
not produce any dangerous runtime changes, but may require touch-ups to
satisfy linters and other tooling.

Note that µsort uses case-insensitive, lexicographical sorting, which
results in a different ordering compared to isort. This provides a more
consistent sorting order, matching the case-insensitive order used when
sorting import statements by module name, and ensures that "frog", "FROG",
and "Frog" always sort next to each other.

For details on µsort's sorting and merging semantics, see the user guide:
https://usort.readthedocs.io/en/stable/guide.html#sorting

Reviewed By: bottler

Differential Revision: D35553814

fbshipit-source-id: be49bdb6a4c25264ff8d4db3a601f18736d17be1

Summary: Use logging instead of printing in the internals of implicitron.

Reviewed By: davnov134

Differential Revision: D35247581

fbshipit-source-id: be5ddad5efe1409adbae0575d35ade6112b3be63

Summary: Pyre expects Mapping for ** operator.

Reviewed By: bottler

Differential Revision: D35288632

fbshipit-source-id: 34d6f26ad912b3a5046f440922bb6ed2fd86f533

Summary: Using the API from D35012121 everywhere.

Reviewed By: bottler

Differential Revision: D35045870

fbshipit-source-id: dab112b5e04160334859bbe8fa2366344b6e0f70

Summary: We often want to iterate over frames in the sequence in temporal order. This diff provides the API to do that. `seq_to_idx` should probably be considered to have `protected` visibility.

Reviewed By: davnov134

Differential Revision: D35012121

fbshipit-source-id: 41896672ec35cd62f3ed4be3aa119efd33adada1

Co-authored-by: Jeremy Francis Reizenstein <bottler@users.noreply.github.com>