In the move to a python version of this script, I didn't notice that
running the bootstrap script in shell mode precluded it from actually
accepting the -disableMetrics argument.
Existing vcpkg installs can be un-metrics'd by re-running the bootstrap
script with the disable argument, or by adding a vcpkg.disable-metrics
file in $VCPKG_ROOT
In addition to changing the build-type dependent build directories, we
can take this opportunity to move the vcpkg cache directory to the Build
folder itself. This probably isn't 100% needed, but it ensures that no
leftover artifacts are used from non-dynamic vcpkg builds, and it's also
generally nice to have all build artifacts under Build.
