python3: add raw prefix in cases harder to analyze at the token level
The `byteify-strings.py` script would be a lot more complicated if it had to
do backtracking and other more advanced static analysis to figure our those
cases, so we have to add the raw prefix to those cases manually.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/