Included autoload functionality and 'cpo' setting/restoring

A year ago (almost exactly) I sent you some e-mails about this plugin, and now I'm back to bother you :-)

I just noticed through `--startuptime` that TortoiseTyping was taking around 78ms of the Vim load time. The proposed modification delays the plugin loading until its is actually used (which may not happen in a daily basis).