Based on serhiy's LGTM I'm uploading hopefully final touches based on his feedback
New in this are changes to Makefile.pre & PCbuild files. I can't really test PCbuild but I did test that make followed by modifying wordcode_helpers.h followed by make rebuilds peephole & compile. There's now also modification of PC/launcher.c to include 3370 as 3.6
Doc/library/dis.rst: I've reverted changes to HAVE_ARGUMENT description since most of my 'pedantic' changes to differentiate between using arguments & ignoring arguments have been reverted