Build Order (#673)

* WIP

* Remove debug msg

* Add required roles

* More roles

* Fix refresh for BuildDetail widget

* Add attachments widget

* Translated text

* Further updates

* More translations

* Form field updates

* Cleanup

* Code formatting

* Fix duplicate import

* formatting

* Remove duplicate switch case

* Update to match modern app

* Improved required parts list

* Filtering for build outputs

* Display list of allocated stock items

* Display source and destination locations

* Fix typo

* Add build orders to drawer

* Fix hard-coded string

* Set default filter value

* Tweak build fields (remove "notes")

* Fixes

* Add "start_date" to build edit form

* Disable editing of build line

* Tweak build item / build detail views

* Remove unused func

* Remove unused import

---------

Co-authored-by: Asterix\Oliver <oliver@currawongeng.com>
Co-authored-by: Oliver Walters <oliver.henry.walters@gmail.com>

lib/widget/attachment_widget.dart

@@ -227,7 +227,7 @@ class _AttachmentWidgetState extends RefreshableState<AttachmentWidget> {
       }
     }
 
-    if (tiles.isEmpty) {
+    if (tiles.isEmpty && !loading) {
       tiles.add(
         ListTile(
           leading: Icon(TablerIcons.file_x, color: COLOR_WARNING),