This file provides ScopedForeignCallback to be used in every callback, and use to provide runtime initialization (now unused).
"RUNTIME SECTION" A function or method that can _use_ the runtime thanks to thread attachment.
RAII struct to cover extern callbacks. This only deals with CPU identification and FPU control words save/restore.
RAII struct for runtime initialization, to be used once by the plug-in client. Without underlying ScopedRuntime, there can be no runtimeSection.