Change special keys into extended commands

Changes most of the special keys used in the main input loop
into extended commands:

- movement keys are now bound to extended commands, eg.
  #movewest and so on.

- m-prefix is now #reqmenu extended command, still bound to
  the 'm' key.

- run, rush, and fight are now extended commands, still bound
  to the same keys as previously.

- nopickup and runnopickup keys are removed.
  Nopickup was using 'm' key, the same as the m-prefix, so
  allow #reqmenu to modify movement commands to disable pickup.

- multiple prefix commands are allowed. This lets user to
  use #reqmenu, followed by #run, followed by movement to simulate
  runnopickup behaviour. (If necessary, adding runnopickup back
  as an extended command would be easy)

doc/Guidebook.mn

@@ -1245,6 +1245,11 @@ To really switch to explore mode, respond with \f(CRy\fP.
 You can set the
 .op paranoid_confirmation:quit
 option to require a response of \f(CRyes\fP instead.
+.lp "#fight   "
+Prefix key to force fight a direction, even if you see nothing
+to fight there.
+Default key is \(oqF\(cq, or \(oq\-\(cq with
+.op number_pad
 .lp "#fire    "
 Fire ammunition from quiver, possibly autowielding a launcher,
 or hit with a wielded polearm.
@@ -1439,6 +1444,10 @@ is on.
 .lp "#remove  "
 Remove an accessory (ring, amulet, etc).
 Default key is \(oqR\(cq.
+.lp "#reqmenu "
+Prefix key to modify the behaviour or request menu from some commands.
+Prevents autopickup when used with movement commands.
+Default key is \(oqm\(cq.
 .lp "#retravel"
 Travel to a previously selected travel destination.
 Default key is \(oqC-_\(cq.
@@ -1451,6 +1460,24 @@ Default key is \(oqM-R\(cq.
 Rub a lamp or a stone.
 Autocompletes.
 Default key is \(oqM-r\(cq.
+.lp "#run     "
+Prefix key to run towards a direction.
+Default key is \(oqG\(cq when
+.op number_pad
+is off,
+\(oq5\(cq when
+.op number_pad
+is set to 1 or 3,
+otherwise \(oqM-5\(cq when it is set to 2 or 4.
+.lp "#rush    "
+Prefix key to rush towards a direction.
+Default is \(oqg\(cq when
+.op number_pad
+is off,
+\(oqM-5\(cq when
+.op number_pad
+is set to 1 or 3,
+otherwise \(oq5\(cq when it is set to 2 or 4.
 .lp "#save    "
 Save the game and exit the program.
 Default key is \(oqS\(cq.
@@ -4775,15 +4802,6 @@ With
 .op number_pad
 only.
 Default is \(oqn\(cq.
-.lp fight
-Prefix key to force fight a direction.
-Default is \(oqF\(cq.
-.lp fight.numpad
-Prefix key to force fight a direction.
-With
-.op number_pad
-only.
-Default is \(oq\-\(cq.
 .lp getdir.help
 When asked for a direction, the key to show the help.
 Default is \(oq?\(cq.
@@ -4874,49 +4892,9 @@ Default is \(oqz\(cq.
 .lp getpos.valid.prev
 When asked for a location, the key to go to previous closest valid location.
 Default is \(oqZ\(cq.
-.lp nopickup
-Prefix key to move without picking up items.
-Default is \(oqm\(cq.
-.lp redraw
-Key to redraw the screen.
-Default is \(oq\(haR\(cq.
-.lp redraw.numpad
-Key to redraw the screen.
-With
-.op number_pad
-only.
-Default is \(oq\(haL\(cq.
 .lp repeat
 Key to repeat previous command.
 Default is \(oq\(haA\(cq.
-.lp reqmenu
-Prefix key to request menu from some commands.
-Default is \(oqm\(cq.
-.lp run
-Prefix key to run towards a direction.
-Default is \(oqG\(cq.
-.lp run.nopickup
-Prefix key to run towards a direction without picking up items on the way.
-Default is \(oqM\(cq.
-.lp run.numpad
-Prefix key to run towards a direction.
-With
-.op number_pad
-only.
-.lp ""
-Default is \(oq5\(cq when number_pad is set to 1 or 3,
-otherwise \(oqM-5\(cq when it is set to 2 or 4.
-.lp rush
-Prefix key to rush towards a direction.
-Default is \(oqg\(cq.
-.lp rush.numpad
-Prefix key to rush towards a direction.
-With
-.op number_pad
-only.
-.lp ""
-Default is \(oqM-5\(cq when number_pad is set to 1 or 3,
-otherwise \(oq5\(cq when it is set to 2 or 4.
 .hn 2
 Configuring Message Types
 .pg