Sales order allocation (#464)

* New string

* Typo fix

* Add model for SalesOrderShipment

* Add placeholder button to sales order item

* Create a new shipment from the sales order detail view

* Fix API URL

* Add paginated shipment list

* Upate colors

* Add API form for allocation of stock to sales order

* Build out sales order line detail widge

* Use unallocated quantity

* Update release notes

* linting fix

lib/widget/order/so_line_list.dart

@@ -63,7 +63,7 @@ class _PaginatedSOLineListState extends PaginatedSearchState<PaginatedSOLineList
         title: Text(part.name),
         subtitle: Text(part.description),
         leading: InvenTreeAPI().getThumbnail(part.thumbnail),
-        trailing: Text(item.progressString),
+        trailing: Text(item.progressString, style: TextStyle(color: item.isComplete ? COLOR_SUCCESS : COLOR_WARNING)),
         onTap: () async {
           showLoadingOverlay(context);
           await item.reload();