refactors atom/var/flags to atom_flags and area_flags
moves NOBLOODY, NOBLUDGEON, and PHORONGUARD to item_flags instead of atom_flags
corrects various misapplied flags
NB. In some cases we go from a more complex image() to a single icon_state string and I assume this works for every case but do not care to check because of the sheer scale of extra fiddly effort. Buyer beware, not my code.