Movement key reworking

Put the rush and run movement keys into g.Cmd instead of bit twiddling
the normal walk keys in multiple places to get the run and rush keys.

Allow meta keys in getpos. Use the normal running keys to fast-move
in getpos, instead of explicit HJKL - I polled couple places online,
and number_pad users did not use the HJKL keys in getpos.

Make meta keys work even after a prefix key.

src/dig.c

@@ -959,10 +959,11 @@ dig_up_grave(coord *cc)
 int
 use_pick_axe(struct obj *obj)
 {
-    const char *sdp, *verb;
+    const char *verb;
     char *dsp, dirsyms[12], qbuf[BUFSZ];
     boolean ispick;
     int rx, ry, downok, res = 0;
+    int dir;
 
     /* Check tool */
     if (obj != uwep) {
@@ -985,13 +986,19 @@ use_pick_axe(struct obj *obj)
     /* construct list of directions to show player for likely choices */
     downok = !!can_reach_floor(FALSE);
     dsp = dirsyms;
-    for (sdp = g.Cmd.dirchars; *sdp; ++sdp) {
+    for (dir = 0; dir < N_DIRS_Z; dir++) {
+        char dirch;
+        if (dir == DIR_DOWN)
+            dirch = cmd_from_func(dodown);
+        else if (dir == DIR_UP)
+            dirch = cmd_from_func(doup);
+        else
+            dirch = g.Cmd.move[dir];
         /* filter out useless directions */
         if (u.uswallow) {
             ; /* all directions are viable when swallowed */
-        } else if (movecmd(*sdp)) {
-            /* normal direction, within plane of the level map;
-               movecmd() sets u.dx, u.dy, u.dz and returns !u.dz */
+        } else if (movecmd(dirch, MV_WALK)) {
+            /* normal direction, within plane of the level map */
             if (!dxdy_moveok())
                 continue; /* handle NODIAG */
             rx = u.ux + u.dx;
@@ -1008,7 +1015,7 @@ use_pick_axe(struct obj *obj)
                 continue;
         }
         /* include this direction */
-        *dsp++ = *sdp;
+        *dsp++ = dirch;
     }
     *dsp = 0;
     Sprintf(qbuf, "In what direction do you want to %s? [%s]", verb, dirsyms);