Quart

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* Bugfix use ContentRange in the right way. See issue 331.
* Bugfix hold a strong reference to background tasks.
* Bugfix avoid ResourceWarning in DataBody.__aiter__.

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* Bugfix DeprecationWarning from datetime.utcnow().
* Bugfix ensure request files are closed.
* Bugfix development restarting when commands are passed.
* Restore teardown_websocket methods.
* Correct the config_class type.
* Allow kwargs to be passed to the test client (matches Flask API).

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* Bugfix program not closing on Ctrl+C in Windows.
* Bugfix the typing for AfterWebsocket functions.
* Improve the typing of the ensure_async method.
* Add a shutdown event to the app.

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* Bugfix update the default config to better match Flask.

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* Bugfix restore the app {after, before}_websocket methods.
* Bugfix correctly set the cli Group in Quart.

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* Bugfix remove QUART_ENV and env usage.