github PR #259 - paranoid_confirmation:trap

Fairly old pull request from copperwater:  add new paranoid_confirm
setting 'trap'.

The old commit suffered from bit rot and merging needed too much
fixing up despite there not being many bands of change in the commit's
diffs.  I ultimately redid it from scratch, although the two biggest
chunks of code started with copy+paste of the pull request's commit.

It operates like paranoid:pray.  Setting paranoid:trap adds a new
"Really step into <trap>?" y/n prompt when attempting to move
into/onto a known trap, even if an object covers it on the map.
Setting both 'paranoid:Confirm trap' turns that into a yes/no prompt.
(Adding 'Confirm' affects other paranoid confirmations; in addition
to requiring yes<return> rather than just y to accept, it also forces
no<return> to reject.)

However, moving into a known trap that is considered to be harmless
behaves as if no trap was present.  Some of the trap classification
might be out of date; several types of traps have undergone changes
since implementation of the original pull request, notably anti-magic
field.  When the hero is hallucinating, all known traps are considered
harmful since the map no longer reliably describes them.

Preceding a movement command with the 'm' prefix also behaves as if
no trap was present, bypassing confirmation for that move, similar to
how paranoid:swim currently behaves.  Being stunned or confused also
behaves as if no trap was present, taking priority over hallucination.

This updates the documentation.

Supersedes #259
Closes #259

src/options.c

@@ -176,9 +176,12 @@ static const struct paranoia_opts {
       "yes vs y to continue eating after first bite when satiated" },
     { PARANOID_WERECHANGE, "Were-change", 2, (const char *) 0, 0,
       "yes vs y to change form when lycanthropy is controllable" },
-    /* extra y/n questions rather than changing y/n to yes/n[o] */
+    /* extra y/n questions rather than changing y/n to yes/n[o];
+       they switch to yes/no if paranoid:confirm is also set */
     { PARANOID_PRAY, "pray", 1, 0, 0,
       "y required to pray (supersedes old \"prayconfirm\" option)" },
+    { PARANOID_TRAP, "trap", 1, "move-trap", 1,
+      "y required to enter known trap unless considered harmless" },
     { PARANOID_AUTOALL, "Autoall", 2, "autoselect-all", 2,
       "y required to pick filter choice 'A' for menustyle:Full" },
     /* not a yes/n[o] vs y/n change nor a y/n addition */