[WIP] Merge commons_category_redirect.py

- use wikidata to get localized Non-empty_category_redirects
  category with -tiny option.
- Set cooldown days with -delay option
- CategoryRedirectBot becomes a subclass of pywikibot.Bot
- split code into pars

Change-Id: Iaa36e36ee39689e376c181df36784a189b40bc4f
Merge "[WIP] Merge commons_category_redirect.py"