With -n/--only-new option ZPA will skip processing plugins/themes that
already have an emoji string assigned. So after adding some new plugins,
one can run with -n/--only-new, to save time. However, plugins/themes
without any emoji string in normal state will be recognized as new and
reprocessed too. That's why it's not 1 vs. 32 minutes, but 9 vs. 32.
A non-rendered character for Github Markdown is needed to mark no-emoji
old/known plugins.
Added zparseopts that processes a few options, from which currently -v/
/--verbose is used – it causes git clone progress-bar to appear. And
of course -n/--only-new.
