swift234

install Foundation via the ninja script and add the test phase for Foundation

The configuration script for Foundation respects debug and release builds so a new option for foundation-build-type has been added to control the build variant of Foundation.
Resolve the FIXME for adding a mechanism for a custom invocation of running the Foundation unit tests
Foundation now has an install target provided from the generated ninja script such that the potentially error prone install script is dramatically simplified into a single encapsulation of a ninja phony target of "install"; so adopt this new target for installation