migrate less to scss, re #3786

resources/assets/javascripts/entry-base.js

resources/assets/javascripts/entry-statusgroups.js

resources/assets/stylesheets/less/breakpoints.less

resources/assets/stylesheets/less/buttons.less

resources/assets/stylesheets/less/files.less

resources/assets/stylesheets/less/tables.less

resources/assets/stylesheets/less/variables.less

resources/assets/stylesheets/less/visibility.less

resources/assets/stylesheets/mixins.less

resources/assets/stylesheets/mixins/arrow.less

resources/assets/stylesheets/mixins/colors.less

resources/assets/stylesheets/mixins/flex.less

resources/assets/stylesheets/mixins/misc.scss

resources/assets/stylesheets/mixins/studip.less

resources/assets/stylesheets/mixins/twitter-mixins.less

resources/assets/stylesheets/print.scss

resources/assets/stylesheets/scss/buttons.scss

resources/assets/stylesheets/scss/files.scss

resources/assets/stylesheets/scss/font-face-lato.scss

resources/assets/stylesheets/scss/fullcalendar-print.scss