add utf8_iterator for adapting byte iterators to iterate on unicode characters
add utf8_iterator for adapting byte iterators to iterate on unicode characters

alexherbo2/kakoune,jjthrash/kakoune,zakgreant/kakoune,Asenar/kakoune,casimir/kakoune,danr/kakoune,Asenar/kakoune,jkonecny12/kakoune,Asenar/kakoune,occivink/kakoune,rstacruz/kakoune,alpha123/kakoune,flavius/kakoune,mawww/kakoune,flavius/kakoune,alexherbo2/kakoune,rstacruz/kakoune,alexherbo2/kakoune,jkonecny12/kakoune,occivink/kakoune,ekie/kakoune,ekie/kakoune,lenormf/kakoune,danr/kakoune,zakgreant/kakoune,elegios/kakoune,lenormf/kakoune,casimir/kakoune,casimir/kakoune,occivink/kakoune,lenormf/kakoune,zakgreant/kakoune,elegios/kakoune,mawww/kakoune,danielma/kakoune,alexherbo2/kakoune,Somasis/kakoune,danielma/kakoune,Somasis/kakoune,alpha123/kakoune,Asenar/kakoune,Somasis/kakoune,jkonecny12/kakoune,xificurC/kakoune,xificurC/kakoune,jjthrash/kakoune,mawww/kakoune,alpha123/kakoune,flavius/kakoune,occivink/kakoune,zakgreant/kakoune,elegios/kakoune,danr/kakoune,danielma/kakoune,mawww/kakoune,xificurC/kakoune,casimir/kakoune,rstacruz/kakoune,danielma/kakoune,elegios/kakoune,ekie/kakoune,jjthrash/kakoune,Somasis/kakoune,danr/kakoune,lenormf/kakoune,xificurC/kakoune,alpha123/kakoune,flavius/kakoune,rstacruz/kakoune,jjthrash/kakoune,jkonecny12/kakoune,ekie/kakoune