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Update mapgen.cpp

Adds coffee/doughnut shop and fast food joint
Update overmap.cpp
Update omdata.h
Update mapitemsdef.cpp

Does repeating an entry here increase the chances that a given item will spawn?
Update mapitems.h
Update mapgen.cpp
Update mapgen.cpp
Update overmap.cpp
Update omdata.h
Update mapitemsdef.cpp
Update mapitems.h
Add a helper function to streamline body temperature unit test.