fix(MR-16): Use cache for FileField and ImageField (#17)

* Remove casting to list in _get_form_data

* Use cache for most fields and admin form for m2m files

* MR comments/clean up

* Cache should obey exclude and fields

* Some more tests and docs

* Only use cache for image files

* Even more tests and handle save as new

* fix test

* More tests

* minor refactor

* Improve test coverage

* Add no cover for some places

* V0.2.3.dev7

* Adding tests for fieldsets

* Added cache timeout

* Added another test for an edge case

* Fix issue with ManagementForm tampered with

* Update cache to only set when form is_multipart

* Even more testing changes

* Update based on comments on MR and clean up a bit

* make test names better

Co-authored-by: Thu Trang Pham <thu@joinmodernhealth.com>

Makefile

@@ -3,6 +3,7 @@ run:
 
 test:
 	coverage run --source admin_confirm --branch -m pytest
+	coverage report -m
 
 check-readme:
 	python -m readme_renderer README.md -o /tmp/README.html