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

models/trelloCreator.js

@@ -369,7 +369,6 @@ export class TrelloCreator {
           // so we make it server only, and let UI catch up once it is done, forget about latency comp.
           const self = this;
           if (Meteor.isServer) {
-            // FIXME: Change to new model
             file.attachData(att.url, function(error) {
               file.boardId = boardId;
               file.cardId = cardId;