Wizard mode wishing for "Amulet of Yendor" has a 50% chance of
yielding a cheap plastic imitation. Allow asking for "real Amulet
of Yendor" and "fake Amulet of Yendor" to provide precise control.
Asking for "real Amulet of Yendor" in normal play will be accepted
but then overridden with the fake amulet as usual.
Without the prefix, there's still a 50:50 chance for either amulet.
"real fake amulet of yendor" and "fake real amulet of yendor" both
yield a fake one.
When handling "amulet of yendor", any of "cheap", "plastic",
"imitation", "cheap plastic", "cheap imitation", and "plastic
imitation" are now recognized to mean "cheap plastic imitation".
Unlike prefixes such as "blessed rustproof" vs "rustproof blessed",
these two-word ones (or the three-word whole thing) need to be in
specific order and after the general prefixes. Also, any of those
force "fake" even if an explicit "real" prefix came before them.
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