cext: extract revlog/index parsing code to own C file parsers.c is ~3000 lines and ~2/3 of it is related to the revlog index type. We already have separate C source files for directory utilities and manifest parsing. I think the quite unwieldy revlog/index parsing code should be self-contained as well. I performed the extraction as a file copy then removed content from both sides in order to preserve file history and blame. As part of this, I also had to move the hexdigit table and function to a shared header since it is used by both parsers.c and revlog.c # no-check-commit