bpo-25324: copy tok_name before changing it (#1608)

bpo-25324: copy tok_name before changing it (#1608)

* add test to check if were modifying token

* copy list so import tokenize doesnt have side effects on token

* shorten line

* add tokenize tokens to token.h to get them to show up in token

* move ERRORTOKEN back to its previous location, and fix nitpick

* copy comments from token.h automatically

* fix whitespace and make more pythonic

* change to fix comments from @haypo

* update token.rst and Misc/NEWS

* change wording

* some more wording changes