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/widget/stock_detail.dart

@@ -292,6 +292,11 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
     fields.remove("part");
     fields.remove("quantity");
     fields.remove("location");
+    fields.remove("serial_numbers");
+
+    if (part == null || !part!.isTrackable) {
+      fields.remove("serial");
+    }
 
     item.editForm(
       context,