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.

include/decl.h

@@ -173,6 +173,15 @@ struct kinfo {
     char name[BUFSZ]; /* actual killer name */
 };
 
+enum movemodes {
+    MV_ANY = -1,
+    MV_WALK,
+    MV_RUN,
+    MV_RUSH,
+
+    N_MOVEMODES
+};
+
 enum movementdirs {
     DIR_ERR = -1,
     DIR_W,
@@ -500,6 +509,8 @@ struct cmd {
     boolean phone_layout;  /* inverted keypad:  1,2,3 above, 7,8,9 below */
     boolean swap_yz;       /* QWERTZ keyboards; use z to move NW, y to zap */
     char move[N_DIRS];     /* char used for moving one step in direction */
+    char rush[N_DIRS];
+    char run[N_DIRS];
     const char *dirchars;      /* current movement/direction characters */
     const char *alphadirchars; /* same as dirchars if !numpad */
     const struct ext_func_tab *commands[256]; /* indexed by input character */