SalesOrderShipment (#697)

* Add detail widget for SalesOrderShipment

* Support editing of shipment details

* Rearrange SalesOrderDetail page

* Add support for attachments against shipment model

* refactoring

* Add shipment details page

* Add user actions for shipments:

- Check / uncheck
- Take photo

* Placeholder action to send shipment

* Send shipment from app

* Display pending shipments on the home screen

* Improve rending for shipments list

* Add class definition for SalesOrderAllocation

* Display list of items allocated against SalesOrderShipment

* Bump release notse

* Click through to stock item

* Bump version number

* dart format

* cleanup

* Remove unused imports

lib/api.dart

@@ -279,6 +279,8 @@ class InvenTreeAPI {
 
   String get username => (userInfo["username"] ?? "") as String;
 
+  int get userId => (userInfo["pk"] ?? -1) as int;
+
   // Map of server information
   Map<String, dynamic> serverInfo = {};