Trac #34956: sage.{misc,monoids,sets}: Replace imports from sage.*.all for namespace packages
Using `./sage -fiximports` from #34945.
Also remove trailing whitespace in the affected files.
Part of Meta-ticket #32414
URL: https://trac.sagemath.org/34956
Reported by: mkoeppe
Ticket author(s): Alex Chandler, Matthias Koeppe
Reviewer(s): Travis Scrimshaw
sage
9cf6aa13 - Trac #34956: sage.{misc,monoids,sets}: Replace imports from sage.*.all for namespace packages