BufferManager: allow iteration on Buffers with begin/end methods
BufferManager: allow iteration on Buffers with begin/end methods

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