Special abilities conferred by wearing dragon armor was implemented in
a somewhat half-assed fashion; extend it to 3/4-assed. Abilities came
from wearing dragon armor but not from being poly'd into a dragon or
for monsters that were wearing dragon armor or actually were dragons.
This covers much of that.
There are umpteen calls of 'resists_foo(mon)' and some are now
'resists_foo(mon) || defended(mon, AD_FOO)' but the second part ought
to be incorporated into update_mon_intrinics() so that the extra
'|| defended()' doesn't have to be spread all over the place and the
ones being put in now could/should be removed.
While testing, I noticed that a monster wielding Fire Brand did not
resist being hit by a wand of fire. This fixes that and should also
fix various comparable situations for other artifacts. But so far it
has only been done for zapping (and any other actions which use the
zapping code). Folding defended() checks into update_mon_intrinsics()
matters more than that probably sounds.
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