Stock display (#379)

* Display stock quantity more prominently

* Cleanup search widget

* Update for stock_detail widget

* More tweaks

* Change bottom bar icon

* Display boolean parameters appropriately

* Adds ability to edit part parameters

* Bump icon size a bit

* Improvements to filter options

- Allow filtering by "option" type
- To start with, filter stock by status code

* Remove debug message

* Remove getTriState method

- No longer needed
- Remove associated unit tests

* Adjust filters based on server API version

* Muted colors

lib/inventree/status_codes.dart

@@ -23,6 +23,26 @@ class InvenTreeStatusCode {
   // Internal status code data loaded from server
   Map<String, dynamic> data = {};
 
+  /*
+   * Construct a list of "choices" suitable for a form
+   */
+  List<dynamic> get choices {
+    List<dynamic> _choices = [];
+
+    for (String key in data.keys) {
+      dynamic _entry = data[key];
+
+      if (_entry is Map<String, dynamic>) {
+        _choices.add({
+          "value": _entry["key"],
+          "display_name": _entry["label"]
+        });
+      }
+    }
+
+    return _choices;
+  }
+
   // Load status code information from the server
   Future<void> load({bool forceReload = false}) async {