Mainly this makes the game only print (None) if there's no equipment.
Previously it would always print (None) for all four slots, and *then*
print the equipment names over top.
The goal is to change any initializations of the flags
value from a 32-bit write to a 16-bit write; this frees
up the upper 16 bits for our use. When setting/clearing
flags in lower bit positions, the game won't delete whatever
we've stored in the upper 16 bits.
jeffman