Update status codes (#307)

* Extra error info when connecting to server

* Adds accessors for various types of status codes

* Cleanup / refactor stock status codes

- No longer need to duplicate these on the app

* improvements to purchase order list

- Add option to show closed orders
- Render order status

* Add purchase order status to order detail widget

* Update release notes

* Cleanup for imports

* linting fixes

lib/widget/stock_detail.dart

@@ -211,6 +211,8 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
   @override
   Future<void> request(BuildContext context) async {
 
+    await api.StockStatus.load();
+
     stockShowHistory = await InvenTreeSettingsManager().getValue(INV_STOCK_SHOW_HISTORY, false) as bool;
 
     final bool result = widget.item.pk > 0 && await widget.item.reload();
@@ -565,9 +567,9 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
         subtitle: Text("${widget.item.partDescription}"),
         leading: InvenTreeAPI().getImage(widget.item.partImage),
         trailing: Text(
-            widget.item.statusLabel(),
+          api.StockStatus.label(widget.item.status),
           style: TextStyle(
-            color: widget.item.statusColor
+            color: api.StockStatus.color(widget.item.status),
           )
         ),
         onTap: () async {