Set target processor type.
Once a processor module is loaded, it cannot be replaced until we close the idb.
processor - name of processor in short form.
level - the request level:
SETPROC_IDB set processor type for old idb
SETPROC_LOADER set processor type for new idb;
if the user has specified a compatible processor,
return success without changing it.
if failure, call loader_failure()
SETPROC_LOADER_NON_FATAL the same as SETPROC_LOADER but non-fatal failures.
SETPROC_USER set user-specified processor
used for -p and manual processor change at later time
success set_processor_type(string processor, long level);
#define SETPROC_IDB 0
#define SETPROC_LOADER 1
#define SETPROC_LOADER_NON_FATAL 2
#define SETPROC_USER 3