Merge pull request #7295 from owncloud/optimize_images_kondou

core/img/actions/add.png

core/img/actions/caret-dark.png

core/img/actions/caret-dark.svg

core/img/actions/caret.png

core/img/actions/caret.svg

core/img/actions/checkmark-white.png

core/img/actions/checkmark-white.svg

core/img/actions/checkmark.png

core/img/actions/checkmark.svg

core/img/actions/clock.png

core/img/actions/clock.svg

core/img/actions/close.png

core/img/actions/delete-hover.png

core/img/actions/delete-hover.svg

core/img/actions/delete.png

core/img/actions/download.png

core/img/actions/history.png

core/img/actions/info.png

core/img/actions/info.svg

core/img/actions/lock.png