chm: create package script for en version

Close myfreeer#12

patch: rebase

PeterFeicht/cppreference-doc@c07b173

patch: rebase

on PeterFeicht/cppreference-doc@808b417

patch: rebase

on PeterFeicht/cppreference-doc@808b417

patch: rebase

on PeterFeicht/cppreference-doc@808b417

patch: rebase

base commit: PeterFeicht/cppreference-doc@9b593ee

preprocess: build qch book

patch: rebase on PeterFeicht/cppreference-doc@22acc79

preprocess: add workaround

chm: escape %

fixes titles like operator""

typo fix