Fix some issues found by Clazy, Cppcheck, and myself

There are sooo many Cppcheck issues left.

added 1 commit

• 1755ecf9 - Simplify conditions to not test "== true" or "== false"

Compare with previous version

I don't see any smoking guns here, but yes limiting scope, preventing copies makes a lot of sense.

Thanks a lot.

mentioned in commit f4cfadbb

merged