Flask-iiif

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- api: fix resize of greyscale source images
- bump flask to >=2.0, pin Werkzeug <3.0
- fix deprecated use of ``attachment_filename``

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- remove custom resizing of GIF

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- Removes encoding of key, due to incompatibility with python3
- Makes temp folder location regarding the generation of gif files configurable
- Removes upper pinning of Werkzeug
- Closes image after usage to avoid leaking memory during api requests
- Migrates CI to gh-actions
- Updates copyright and contributors

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- Added missing ``app`` argument for the ``flask_iiif.cache.ImageCache``
constructor.

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- Removes support for Python 2.7
- Image API specification fixes
- Support both ``gray`` and ``grey`` as valid qualities.
- Rotations are now performed clock-wise.
- No padding added to resized images.
- Better support for image extension conversions (``.tif/.tiff``, ``.jp2``).
- Pillow bumped to v4.0
- Introduced ``IIIF_CACHE_IGNORE_ERRORS`` config variable to allow ignoring
cache access exceptions.
- Changed ``current_iiif.cache`` from a callable function to a Werkzeug
``cached_property``.

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- Adds Last-Lodified and If-Modified-Since to imageapi
- Removes warning message for LocalProxy
- Fixes werkzeug deprecation warning