Move In Progress ostrio-files changes to separate branch, and revert ostrio-files changes, so that:

- Export to CSV/TSV with custom fields works
- Attachments are not exported to disk
- It is possible to build arm64/s390x versions again.

Thanks to xet7 !

Related #3110

client/components/cards/minicard.js

@@ -52,7 +52,4 @@ Template.minicard.helpers({
       return false;
     }
   },
-  coverUrl() {
-    return Attachments.findOne(this.coverId).link('original', '/');
-  },
 });