Cleans up dr_frontend.h and sets it up for direct copying.
Moves dr_probe.h content from hotpatch.c and globals_shared.h and places it in a new file core/lib/probe_api.h for direct copying to dr_probe.h.
Separates exported content from core/arch/proc.h into core/arch/proc_api.h, which is exported directly as dr_proc.h.
Issue: #3092 (closed)