Remove unused header file and references to it

include/all.h

@@ -56,7 +56,6 @@
 #include "render.h"
 #include "window.h"
 #include "match.h"
-#include "cmdparse.h"
 #include "xcursor.h"
 #include "resize.h"
 #include "sighandler.h"

include/cmdparse.h

@@ -1,14 +0,0 @@
-/*
- * vim:ts=4:sw=4:expandtab
- *
- * i3 - an improved dynamic tiling window manager
- * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
- *
- * cmdparse.y: the parser for commands you send to i3 (or bind on keys)
- *
- */
-#pragma once
-
-#include <config.h>
-
-char *parse_cmd(const char *new);