Only apply the CURSE OF GOZAG to items new to the player.

This disallows scumming the wrath by dropping and picking up rations,
etc.
Make Gozag-distracting gold itself shine as opposed to show an aura.

That is, the tiles surrounding it don't glow; only the gold itself does.

Should be less visually spammy.

TODO: make the gold aura icons sparkly; actually remove the aura (which
is presently used only to make sure the aura shows up in tiles).
Fix Agony, etc. enchantment power modifiers (#9273).

Overloading this field is abominably stupid; it needs to at least be a
union if not a completely separate field.