Merge pull request #1534 from nextcloud/svg-optimization

apps/comments/img/comments.svg

apps/encryption/img/app.svg

apps/federatedfilesharing/img/social-diaspora.svg

apps/federatedfilesharing/img/social-facebook.svg

apps/federatedfilesharing/img/social-googleplus.svg

apps/federatedfilesharing/img/social-twitter.svg

apps/federation/img/app.svg

apps/files/img/delete.svg

apps/files/img/external.svg

apps/files/img/folder.svg

apps/files/img/public.svg

apps/files/img/recent.svg

apps/files/img/share.svg

apps/files/img/star.svg

apps/files_external/img/app.svg

apps/files_sharing/img/app.svg

apps/files_trashbin/img/app.svg

apps/files_versions/img/app.svg

apps/provisioning_api/img/app.svg

apps/systemtags/img/app.svg