Open master.gsav in binary mode for reading.
Properly skip separators while loading master.gsav.
Properly load faction "known_by_u" as a bool.
Merge branch 'pr/4255'
Changed remaining mon_id access in iuse.cpp
Got rid of mon_id inclusions in mission.h
Forgot to change one last thing from mon_id::mon_null to 'mon_null'