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-show-messages.c

@@ -36,7 +36,6 @@ const struct cmd_entry cmd_show_messages_entry = {
 	"IJTt:", 0, 0,
 	"[-IJT] " CMD_TARGET_CLIENT_USAGE,
 	0,
-	NULL,
 	cmd_show_messages_exec
 };
 
@@ -45,7 +44,6 @@ const struct cmd_entry cmd_server_info_entry = {
 	"", 0, 0,
 	"",
 	0,
-	NULL,
 	cmd_show_messages_exec
 };