* Add pre-commit hooks for basic standards conformity checking
* These should not be marked as executable
* These lack shebangs so marking them executable did not do anyone any good
* add pre-commit to dev requirements
* use pre-commit framework for the hook
* Move the pre-commit config outside of root
As discusses in https://github.com/kivy/kivy/pull/7176#discussion_r511240059
* Document that pre-commit is used and how to skip checks if needed
* Mark the old hook script as deprecated
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