Stock item serial number functionality (#199)

* Stock item serial number functionality

- Allow serial numbers to be specified when creating a new stock item
- Allow serial number to be edited from stock item context

* Update build number and release notes

lib/inventree/stock.dart

@@ -199,6 +199,11 @@ class InvenTreeStockItem extends InvenTreeModel {
       "part": {},
       "location": {},
       "quantity": {},
+      "serial": {},
+      "serial_numbers": {
+        "label": L10().serialNumber,
+        "type": "string",
+      },
       "status": {},
       "batch": {},
       "packaging": {},