Found via `codespell -q 3 --skip="./3rdparty" -I ../opencv-whitelist.txt`

Fixed exceptions, print statements, and long types for gen_pattern.py to be Python 3 compatible (#7994)

* fixed exceptions and print statements to be python 3 compatible; removed long type checks (py3 uses int); whitespace reformatting

* Pulled latest svgfig from upstream

https://github.com/jpivarski/svgfig/commit/f3179a8926508bf0f9021fd4e1f9731c95524a38

Also, removed the one from modules/python/src2/cv.py and cleared its
executable bit, since it's not a script.