Ranges: Fix copiability of some range view iterators
Ranges: Fix copiability of some range view iterators

Some iterators were refering to to their view with a const ref, this
was making them non-copiable. Change those const ref into const pointers
in order to fix that.

occivink/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,mawww/kakoune,jjthrash/kakoune,Somasis/kakoune,lenormf/kakoune,occivink/kakoune,casimir/kakoune,Somasis/kakoune,danr/kakoune,danr/kakoune,mawww/kakoune,alexherbo2/kakoune,lenormf/kakoune,jkonecny12/kakoune,occivink/kakoune,casimir/kakoune,alexherbo2/kakoune,mawww/kakoune,lenormf/kakoune,casimir/kakoune,alexherbo2/kakoune,jjthrash/kakoune,jkonecny12/kakoune,danr/kakoune,mawww/kakoune,occivink/kakoune,jjthrash/kakoune,danr/kakoune,casimir/kakoune,jkonecny12/kakoune,jjthrash/kakoune,Somasis/kakoune,lenormf/kakoune,Somasis/kakoune