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-load-buffer.c

@@ -39,7 +39,6 @@ const struct cmd_entry cmd_load_buffer_entry = {
 	"b:", 1, 1,
 	CMD_BUFFER_USAGE " path",
 	0,
-	NULL,
 	cmd_load_buffer_exec
 };