simplify and uncomment item-fn-arg hygiene unit test
comments, whitespace, rename NameFinderContext to PatIdentFinder
move RenameList to mtwt
add PatIdentRenamer
comments only
implement hygiene for arguments of item functions

Closes #9384
make any_pat! macro hygienic
DONT LET THIS COMMIT GO UPSTREAM
added test for method arg hygiene
hygiene for method args
new_mark -> apply_mark
new_rename -> apply_rename
remove vestigial parsing of 1 .. id