Get rid of __future__ imports

Review Request #11944 — Created Jan. 20, 2022 and submitted — Latest diff uploaded

Information

Djblets
release-3.x

Reviewers

Now that Djblets is Python 3.7+, we don't need to import stuff from
__future__ in every file. This change does that, and removes some old
leftover per-file copyright headers while I'm in there.

Ran unit tests.

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