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/stock/migrations/0097_alter_stockitem_notes.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.18 on 2023-04-19 00:37
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0096_auto_20230330_1121'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitem',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+    ]

InvenTree/stock/models.py

@@ -29,10 +29,9 @@ import InvenTree.tasks
 import label.models
 import report.models
 from company import models as CompanyModels
-from InvenTree.fields import (InvenTreeModelMoneyField, InvenTreeNotesField,
-                              InvenTreeURLField)
+from InvenTree.fields import InvenTreeModelMoneyField, InvenTreeURLField
 from InvenTree.models import (InvenTreeAttachment, InvenTreeBarcodeMixin,
-                              InvenTreeTree, extract_int)
+                              InvenTreeNotesMixin, InvenTreeTree, extract_int)
 from InvenTree.status_codes import (SalesOrderStatus, StockHistoryCode,
                                     StockStatus)
 from part import models as PartModels
@@ -279,7 +278,7 @@ def default_delete_on_deplete():
         return True
 
 
-class StockItem(InvenTreeBarcodeMixin, MetadataMixin, common.models.MetaMixin, MPTTModel):
+class StockItem(InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, common.models.MetaMixin, MPTTModel):
     """A StockItem object represents a quantity of physical instances of a part.
 
     Attributes:
@@ -800,8 +799,6 @@ class StockItem(InvenTreeBarcodeMixin, MetadataMixin, common.models.MetaMixin, M
         """Return the text representation of the status field"""
         return StockStatus.text(self.status)
 
-    notes = InvenTreeNotesField(help_text=_('Stock Item Notes'))
-
     purchase_price = InvenTreeModelMoneyField(
         max_digits=19,
         decimal_places=6,