…, for a few cases on Windows

- For GC/debugger suspension, a new variant of an APC is used to interrupt the thread
- For hardware exceptions, an exception is raised from the vectored exception handler instead of redirecting and then raising an exception
- Made changes to enable /guard:ehcont and /cetcompat for binaries, but commented out the enablement for now since it looks like we will first need .pgd files generated with /guard:ehcont and published for release builds to succeed

…hrough the stub