W_WEAPON, W_ACCESSORY

W_WEAPON, W_ACCESSORY

Add macros W_WEAPON and W_ACCESSORY, similar to existing W_ARMOR, bitmask
of all the relevant worn bits.  Just for code readability; there should
be no change in behavior.

Also, reformat the "ugly checks" portion of getobj().  Slightly better
readability and fewer continuation lines, but only a modest improvement.