Stock location scan (#169)

* Add action for scanning a stock location into another location

* Adds barcode scan handler for new functionality

* Handle scanning of stock location

* Cleanup

* Refactor existing barcode scanning functions

- Will require extensive testing and validation

* Add entry to release notes

* Delete dead code

* Improved ordering based on stock quantity

* Bug fix for 'adjustStock' function

* Improve error responses for barcode scanning

* Improve error responses for barcode scanning

* Remove old debug statements

* Add some extra explanatory texts

* Icon change

* Fixes for unit tests

* Adds extra functionality for user profile manager

* Refactor barcode code - do not rely on BuildContext

* Adds initial unit testing for barcode scanning

- Work on mocking barcode data
- Add hooks for testing snackBar and audio files

* Linting fixes

* More barcode unit tests

* Cleanup unit tests for barcode

* Remove unused import

* Handle HTTPException in API

* Improvements for API unit testing

* Unit testing for scanning item into location

* Add unit test for scanning in items from a location context

* Unit test for scanning location into parent location

* Improve feedback for barcode scanning events

lib/inventree/model.dart

@@ -107,6 +107,9 @@ class InvenTreeModel {
 
   }
 
+  /*
+   * Launch a modal form to edit the fields available to this model instance.
+   */
   Future<void> editForm(BuildContext context, String title, {Map<String, dynamic> fields=const {}, Function(dynamic)? onSuccess}) async {
 
     if (fields.isEmpty) {
@@ -317,7 +320,7 @@ class InvenTreeModel {
   }
 
   // POST data to update the model
-  Future<bool> update({Map<String, String> values = const {}}) async {
+  Future<APIResponse> update({Map<String, String> values = const {}, int? expectedStatusCode = 200}) async {
 
     var url = path.join(URL, pk.toString());
 
@@ -325,17 +328,13 @@ class InvenTreeModel {
       url += "/";
     }
 
-    var response = await api.patch(
+    final response = await api.patch(
       url,
       body: values,
-      expectedStatusCode: 200
+      expectedStatusCode: expectedStatusCode,
     );
 
-    if (!response.isValid()) {
-      return false;
-    }
-
-    return true;
+    return response;
   }
 
   // Return the detail view for the associated pk