Add Dart highliting for private classes
Add Dart highliting for private classes

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