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/ordering.py

@@ -1,5 +1,10 @@
 import re
 
+__all__ = (
+    'naturalize',
+    'naturalize_interface',
+)
+
 INTERFACE_NAME_REGEX = r'(^(?P<type>[^\d\.:]+)?)' \
                        r'((?P<slot>\d+)/)?' \
                        r'((?P<subslot>\d+)/)?' \