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All this crap is very brittle due to circular deps and python handling
them badly. This appears to be fixing some stuff, at the very least.

This is sed, so cleanup of imports (which can now be grouped together)
is not done yet.

Also only run one regex on search_for_color()

Reduce the number of calls to config.get whenever possible. Yields a
performance improvement of at least 10% for the basic use case of
"receiving a message in the current tab". Logging stuff isn’t free
either, even when the call should be a no-op, so we should try to make
the debug log less verbose.