Add ProjectCode support to build orders (#4808)

* Add "project_code" field to Build model

* Add "project_code" field to Build model

* build javascript updates

(cherry picked from commit 3e27a3b739)

* Update table filters

(cherry picked from commit 196c675585)

* Adds API filtering

* Bump API version

* Hide project code field from build form if project codes not enabled

(cherry picked from commit 4e210e3dfa)

* refactoring to attempt to fix circular imports

* Upgrade django-test-migrations package

* Fix broken import

* Further fixes for unit tests

* Update unit tests for migration files

* Fix typo in build.js

* Migration test updates

- Need to specify MPTT stuff

* Fix build.js

* Fix migration order

* Update API version

InvenTree/plugin/test_api.py

@@ -54,7 +54,7 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         ).data
         self.assertEqual(data['success'], True)
 
-        # valid - github url and packagename
+        # valid - github url and package name
         data = self.post(
             url,
             {