Merge pull request #20530 from owncloud/icons-more

core/css/icons.css

core/img/actions/add.svg

core/img/actions/checkbox-checked-disabled.png

core/img/actions/checkbox-checked-disabled.svg

core/img/actions/checkbox-checked.svg

core/img/actions/checkbox-disabled-white.png

core/img/actions/checkbox-disabled-white.svg

core/img/actions/checkbox-disabled.png

core/img/actions/checkbox-disabled.svg

core/img/actions/checkbox-mixed.svg

core/img/actions/checkbox.svg

core/img/actions/checkmark-color.png

core/img/actions/checkmark-color.svg

core/img/actions/checkmark-white.svg

core/img/actions/checkmark.svg

core/img/actions/close.svg

core/img/actions/delete-hover.png

core/img/actions/delete-hover.svg

core/img/actions/delete.png

core/img/actions/download.svg