Instead of setting up the default keys by building the key struct

directly with a helper function in the cmd_entry, include a table of
bind-key commands and pass them through the command parser and a
temporary cmd_q.

As well as being smaller, this will allow default bindings to be command
sequences which will probably be needed soon.

cmd-new-window.c

@@ -38,7 +38,6 @@ const struct cmd_entry cmd_new_window_entry = {
 	"[-adkP] [-c start-directory] [-F format] [-n window-name] "
 	CMD_TARGET_WINDOW_USAGE " [command]",
 	0,
-	NULL,
 	cmd_new_window_exec
 };