* [scripts-audit] Remove vcpkg_build_gn
This command has never been used (git log -S"vcpkg_build_gn\("
gives no results outside of the file itself and docs)
and so shrink the public interface surface
* [scripts-audit] gn buildsystem
* format
* oops
* aaaugh
* cr
* [scripts-audit rollup] PR #16419
* pull the cmake doc comment parsing out into its own function
* support cmake helper ports
* add real support for deprecation, as opposed to ad-hoc
* [scripts-audit rollup] PR #16192
* add a z_ in front of internal functions
* move internal functions out
set feature_vars again in parent scope
* [scripts-audit rollup] PR #16309
Audit vcpkg_copy_pdbs
* [scripts-audit rollup] PR #16304
* Fix usage, documentation
* [scripts-audit rollup] PR #16393
* [scripts-audit rollup] PR #16377
Deprecate `vcpkg_*_cmake` in favor of `vcpkg_cmake_*` from the
`vcpkg-cmake` port, as well as `vcpkg_fixup_cmake_targets`
in favor of `vcpkg_cmake_config_fixup` from the
`vcpkg-cmake-config` port.
