_loader/loader: cythonize valid_chars_name

Benjamin Schubertrequested to merge
bschubert/cythonize-valid-char-names into master

Description

valid_chars_name is called a lot, extracting it to cython allwos us to speed up loading

commit action python_version max_memory time
master - 1233899f show py37 1403 71.43
bschubert/cythonize-valid-char-names - 02b8eec7 show py37 1403 70.55
Edited by Benjamin Schubert

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