Remove reliance on django-markdownx (#3231)

* Remove reliance on django-markdownx

- We are now rendering notes on the client side using easymde
- No longer any need to utilize the markdownx integration
- Adds character limit for notes fields`

* Adjust legacy migrations - remove references to markdownx

* Fix bug for company notes field

InvenTree/build/migrations/0008_auto_20200201_1247.py

@@ -1,7 +1,6 @@
 # Generated by Django 2.2.9 on 2020-02-01 12:47
 
-from django.db import migrations
-import markdownx.models
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
@@ -14,6 +13,6 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='build',
             name='notes',
-            field=markdownx.models.MarkdownxField(blank=True, help_text='Extra build notes'),
+            field=models.TextField(blank=True, help_text='Extra build notes'),
         ),
     ]

InvenTree/build/migrations/0014_auto_20200425_1243.py

@@ -4,7 +4,6 @@ import InvenTree.fields
 import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
-import markdownx.models
 import mptt.fields
 
 
@@ -31,7 +30,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='build',
             name='notes',
-            field=markdownx.models.MarkdownxField(blank=True, help_text='Extra build notes', verbose_name='Notes'),
+            field=models.TextField(blank=True, help_text='Extra build notes', verbose_name='Notes'),
         ),
         migrations.AlterField(
             model_name='build',

InvenTree/build/migrations/0035_alter_build_notes.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.13 on 2022-06-20 07:28
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('build', '0034_alter_build_reference_int'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='build',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Extra build notes', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+    ]

InvenTree/build/models.py

@@ -16,8 +16,6 @@ from django.dispatch.dispatcher import receiver
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 
-from markdownx.models import MarkdownxField
-
 from mptt.models import MPTTModel, TreeForeignKey
 from mptt.exceptions import InvalidMove
 
@@ -320,9 +318,8 @@ class Build(MPTTModel, ReferenceIndexingMixin):
         blank=True, help_text=_('Link to external URL')
     )
 
-    notes = MarkdownxField(
-        verbose_name=_('Notes'),
-        blank=True, help_text=_('Extra build notes')
+    notes = InvenTree.fields.InvenTreeNotesField(
+        help_text=_('Extra build notes')
     )
 
     def sub_builds(self, cascade=True):