add 'montelecontrol' option (wizard-mode only)

Add a new debugging option, 'montelecontrol', that allows a wizard-
mode player to choose a teleporting monster's destination.  If player
picks a bad spot, confirmation will be requested.  If accepted, the
spot will be used even though the consequences could be bad; that's
on the player.  If rejected, the destination will be assigned as if
no control had been attempted rather than try again.

The fuzzer isn't allowed to override a bad spot if it tries to pick
one.  That would probably trigger a sanity_check warning; the fuzzer
causes impossible warnings to behave as if panic, so accepting a bad
spot would just be fuzzer suicide.  It is allowed to randomly set the
option and maybe--though extremely unlikely--randomly pick a valid
controlled destination.

doc/Guidebook.mn

@@ -37,7 +37,7 @@
 .ds f0 "\*(vr
 .ds f1
 .\"DO NOT REMOVE NH_DATESUB .ds f2 "DATE(%B %-d, %Y)
-.ds f2 "May 7, 2023
+.ds f2 "June 8, 2023
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
@@ -4121,6 +4121,9 @@ Default \(oq}\(cq.
 .lp monpolycontrol
 Prompt for new form whenever any monster changes shape (default off).
 Debug mode only.
+.lp montelecontrol
+Prompt for destination whenever any monster gets teleported (default off).
+Debug mode only.
 .lp mouse_support
 Allow use of the mouse for input and travel.
 Valid settings are: