* fix: migrate drop the wrong m2m field when model have multi m2m fields
* Make style and update changelog
* refactor: return new lists instead of change argument values in function
* refactor: use custom diff function instead of reorder lists
* docs: fix typo
* Fix hardcoded and rename custom diff function
* Update function doc
* Fix KeyError when deleting a field with unqiue=True
* refactor: rename `old_data_unique` to `is_unique_field`
* Add testcases for remove unique field
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Co-authored-by: gongchangku <gongchangku@anban.tech>
Co-authored-by: Waket Zheng <waketzheng@gmail.com>
