* [vcpkg.cmake] modify to get in line with the audit
See PR #16055
This also (attempts to) allow vcpkg.cmake to run with cmake 3.0; we had
a VERSION_GREATER_EQUAL check, but that if keyword was added in cmake
3.7.
* s/target_name/package_name in find_package
* depend on z_vcpkg_function_arguments
instead of a custom macro
also, as a drive-by, switch to foreach(X IN LISTS ...)
* split the utility macros/functions out
additionally, move the options and settings to the top of the file
* move more options and settings to the top
* fix name of file
* fix ras code comments
* remove z_vcpkg_utilities due to export
* add cmake_policy(PUSH|POP)
* add VCPKG_INSTALLED_DIR input variable
* add .cmakestamp to vcpkg_installed
* fix osx ifs to use quotes
also, remove spaces between if and (, to keep style consistent
(mostly for ease of grepping...)
* fix bug fixed by #16193
* move z_vcpkg_add_fatal_error up
* fix RANGE for reals
