Closes #12246: General cleanup of utilities modules

* Clean up base modules

* Clean up forms modules

* Clean up templatetags modules

* Replace custom simplify_decimal filter with floatformat

* Misc cleanup

* Merge ReturnURLForm into ConfirmationForm

* Clean up import statements for utilities.forms

* Fix field class references in docs

netbox/utilities/migration.py

@@ -3,6 +3,10 @@ from timezone_field import TimeZoneField
 
 from netbox.config import ConfigItem
 
+__all__ = (
+    'custom_deconstruct',
+)
+
 
 SKIP_FIELDS = (
     TimeZoneField,