Support image uploads in the "notes" markdown fields (#4615)

* 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

* Bug fix for barcode refactoring

* Add unit testing for function

InvenTree/plugin/builtin/barcodes/inventree_barcode.py

@@ -11,12 +11,8 @@ import json
 
 from django.utils.translation import gettext_lazy as _
 
-import build.models
-import company.models
-import order.models
-import part.models
-import stock.models
-from InvenTree.helpers import hash_barcode
+from InvenTree.helpers import getModelsWithMixin, hash_barcode
+from InvenTree.models import InvenTreeBarcodeMixin
 from plugin import InvenTreePlugin
 from plugin.mixins import BarcodeMixin
 
@@ -34,16 +30,7 @@ class InvenTreeInternalBarcodePlugin(BarcodeMixin, InvenTreePlugin):
     def get_supported_barcode_models():
         """Returns a list of database models which support barcode functionality"""
 
-        return [
-            build.models.Build,
-            company.models.SupplierPart,
-            order.models.PurchaseOrder,
-            order.models.ReturnOrder,
-            order.models.SalesOrder,
-            part.models.Part,
-            stock.models.StockItem,
-            stock.models.StockLocation,
-        ]
+        return getModelsWithMixin(InvenTreeBarcodeMixin)
 
     def format_matched_response(self, label, model, instance):
         """Format a response for the scanned data"""