arogue7, xrogue: add support for keypad 5. Keypad 5 is now equivalent to the '.' key. XRogue does not include md_readchar() and its ability to work around deficiencies in the terminfo entry. So the key will not be recognized in screen/tmux or anywhere else without the kb2 capability. Adding md_readchar() would be more complex than it was for Super-Rogue, since XRogue already does KEY_* interpretation in command().