refactor: small lint rule changes; lint about half of the units
rule changes
consistent-this
this is way too subtle to try to do quickly / in bulk. i don't want to see subtle bugs added because of "find and replace" failing to account for context.
no-underscore-dangle
this is cosmetic and by the count this is already prevalent, so it stays.
lint status
about halfway through the units. i don't want to do them all at once because they'd be impossible to test that way.