Project code support (#4636)

* Support image uploads in the "notes" markdown fields

- Implemented using the existing EasyMDE library
- Copy / paste support
- Drag / drop support

* Remove debug message

* Updated API version

* Better UX when saving notes

* Pin PIP version (for testing)

* Bug fixes

- Fix typo
- Use correct serializer type

* Add unit testing

* Update role permissions

* Typo fix

* Update migration file

* Adds a notes mixin class to be used for refactoring

* Refactor existing models with notes to use the new mixin

* Add helper function for finding all model types with a certain mixin

* Refactor barcode plugin to use new method

* Typo fix

* Add daily task to delete old / unused notes

* Add ProjectCode model

(cherry picked from commit 382a0a2fc32c930d46ed3fe0c6d2cae654c2209d)

* Adds IsStaffOrReadyOnly permissions

- Authenticated users get read-only access
- Staff users get read/write access

(cherry picked from commit 53d04da86c4c866fd9c909d147d93844186470b4)

* Adds API endpoints for project codes

(cherry picked from commit 5ae1da23b2eae4e1168bc6fe28a3544dedc4a1b4)

* Add migration file for projectcode model

(cherry picked from commit 5f8717712c65df853ea69907d33e185fd91df7ee)

* Add project code configuration page to the global settings view

* Add 'project code' field to orders

* Add ability to set / edit the project code for various order models

* Add project code info to order list tables

* Add configuration options for project code integration

* Allow orders to be filtered by project code

* Refactor table_filters.js

- Allow orders to be filtered dynamically by project code

* Bump API version

* Fixes

* Add resource mixin for exporting project code in order list

* Add "has_project_code" filter

* javascript fix

* Edit / delete project codes via API

- Also refactor some existing JS

* Move MetadataMixin to InvenTree.models

To prevent circular imports

(cherry picked from commit d23b013881eaffe612dfbfcdfc5dff6d729068c6)

* Fixes for circular imports

* Add metadata for ProjectCode model

* Add Metadata API endpoint for ProjectCode

* Add unit testing for ProjectCode API endpoints

InvenTree/stock/models.py

@@ -31,12 +31,12 @@ import report.models
 from company import models as CompanyModels
 from InvenTree.fields import InvenTreeModelMoneyField, InvenTreeURLField
 from InvenTree.models import (InvenTreeAttachment, InvenTreeBarcodeMixin,
-                              InvenTreeNotesMixin, InvenTreeTree, extract_int)
+                              InvenTreeNotesMixin, InvenTreeTree,
+                              MetadataMixin, extract_int)
 from InvenTree.status_codes import (SalesOrderStatus, StockHistoryCode,
                                     StockStatus)
 from part import models as PartModels
 from plugin.events import trigger_event
-from plugin.models import MetadataMixin
 from users.models import Owner