Pkgconf

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* Features:

* Enhancements:
- Convert manpages to mdoc(7)

* Bug fixes:
- Fix parsing multiline fields

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* Features:
- add a sub --debug

* Enhancements:
- Do not hardcode non-posix install(1)

* Bug fixes:
- fix --with-system-includedir and --with-system-libdir behaviour

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* Features:

* Enhancements:
- Make all variables but CFLAGS and LIBS case sensitive

* Bug fixes:

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* Features:
- Add a pkgconf(1) manpage

* Enhancements:
- Improve support for MacOS -framework

* Bug fixes:

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* Features:
- Add support for CFLAGS.private

* Enhancements:
- Support out of source build
- Improved private libs deduplication

* Bug fixes:

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* Features:

* Enhancements:

* Bug fixes:
- Fix PKG_CONFIG_PATH being ignored when a .pc is directly supplied from
command line