Create superclass for log entries with user targets
Create superclass for log entries with user targets

This superclass will override the user() method so it returns a
User object instead of a Page object.

Change-Id: Iccce2364e67dc8e4975cea9b07c782d58a700b2f

PersianWikipedia/pywikibot-core,happy5214/pywikibot-core,npdoty/pywikibot,happy5214/pywikibot-core,hasteur/g13bot_tools_new,wikimedia/pywikibot-core,magul/pywikibot-core,npdoty/pywikibot,wikimedia/pywikibot-core,hasteur/g13bot_tools_new,magul/pywikibot-core,hasteur/g13bot_tools_new