Django-feature-policy

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* Updated to the latest set of features from Chrome. This removes
'legacy-image-formats' and 'unoptimized-images', and adds 17 new features:
'downloads-without-user-activation', 'focus-without-user-activation',
'forms', 'hid', 'idle-detection', 'loading-frame-default-eager', 'modals',
'orientation-lock', 'pointer-lock', 'popups', 'presentation', 'scripts',
'serial', 'top-navigation', 'unoptimized-lossless-images',
'unoptimized-lossless-images-strict' and 'unoptimized-lossy-images'. Note
that most of these are still experimental as can be seen on the [W3C feature
list](https://github.com/w3c/webappsec-feature-policy/blob/master/features.md).

* Stop marking the distributed wheel as universal. Python 2 was never supported
so the wheel was never actually universal.

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* Update Python support to 3.5-3.7, as 3.4 has reached its end of life.

* Make the generated header deterministic by iterating the settings dict in
sorted order.

* Support Django 1.11 for completeness.

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* Fix interpretation of '*' by not automatically adding quotes.
* Optimize header generation to reduce impact on every request.

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* Tested on Django 2.2. No changes were needed for compatibility.

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* Updated to the latest set of features from Chrome.
'animations', 'image-compression', and 'max-downscaling-image' have been
removed, whilst 'document-domain', 'font-display-late-swap',
'layout-animations', 'oversized-images', 'unoptimized-images', and
'wake-lock' have been added.
See more at https://github.com/w3c/webappsec-feature-policy/blob/master/features.md .

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* Support for new 'lazyload' feature, per https://www.chromestatus.com/feature/5641405942726656.