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/build/migrations/0042_alter_build_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 = [
+        ('build', '0041_alter_build_title'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='build',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+    ]

InvenTree/build/models.py

@@ -23,7 +23,7 @@ from rest_framework import serializers
 
 from InvenTree.status_codes import BuildStatus, StockStatus, StockHistoryCode
 from InvenTree.helpers import increment, normalize, notify_responsible
-from InvenTree.models import InvenTreeAttachment, InvenTreeBarcodeMixin, ReferenceIndexingMixin
+from InvenTree.models import InvenTreeAttachment, InvenTreeBarcodeMixin, InvenTreeNotesMixin, ReferenceIndexingMixin
 
 from build.validators import generate_next_build_reference, validate_build_order_reference
 
@@ -42,7 +42,7 @@ import stock.models
 import users.models
 
 
-class Build(MPTTModel, InvenTreeBarcodeMixin, MetadataMixin, ReferenceIndexingMixin):
+class Build(MPTTModel, InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, ReferenceIndexingMixin):
     """A Build object organises the creation of new StockItem objects from other existing StockItem objects.
 
     Attributes:
@@ -293,10 +293,6 @@ class Build(MPTTModel, InvenTreeBarcodeMixin, MetadataMixin, ReferenceIndexingMi
         blank=True, help_text=_('Link to external URL')
     )
 
-    notes = InvenTree.fields.InvenTreeNotesField(
-        help_text=_('Extra build notes')
-    )
-
     priority = models.PositiveIntegerField(
         verbose_name=_('Build Priority'),
         default=0,