[FEAT] replace: Warn about format chars in string
[FEAT] replace: Warn about format chars in string

When a string contains formatting characters like U+200E it's not immediately
visible and it might not match text. So this is warning about all chars in the
Cf category as defined by the Unicode standard.

Change-Id: I38ffb9e63d6827de0a42ace39073105aa6761d2e

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