kakrc: add preserve_indent filter on c++ files and highlight trailing spaces
kakrc: add preserve_indent filter on c++ files and highlight trailing spaces

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