Port getFirstUploader to core. For compatibility with compat only.
Port getFirstUploader to core. For compatibility with compat only.

Change-Id: Iaa9848d7020f994e090fbae3356a1a661239e904

xZise/pywikibot-core,Darkdadaah/pywikibot-core,wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core,magul/pywikibot-core,smalyshev/pywikibot-core,VcamX/pywikibot-core,icyflame/batman,trishnaguha/pywikibot-core,happy5214/pywikibot-core,npdoty/pywikibot,valhallasw/pywikibot-core,hasteur/g13bot_tools_new,h4ck3rm1k3/pywikibot-core,happy5214/pywikibot-core,wikimedia/pywikibot-core,hasteur/g13bot_tools_new,TridevGuha/pywikibot-core,emijrp/pywikibot-core,npdoty/pywikibot,hasteur/g13bot_tools_new,darthbhyrava/pywikibot-local,jayvdb/pywikibot-core,magul/pywikibot-core,h4ck3rm1k3/pywikibot-core,Darkdadaah/pywikibot-core,jayvdb/pywikibot-core