Omero-iviewer

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- Image loading error handling ([474](https://github.com/ome/omero-iviewer/pull/474))
- Tile loading improvements, spinners and error handling ([470](https://github.com/ome/omero-iviewer/pull/470))
- Upgrade several JavaScript dependencies

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- Add support for "mirroring" (flipping of image in X and Y axes - Thanks to [Michael Barrett](https://github.com/barrettMCW)) ([#439](https://github.com/ome/omero-iviewer/pull/439))
- Make app compatible with Django 4.0.x ([451](https://github.com/ome/omero-iviewer/pull/451))
- Upgrade Aurelia framework ([422](https://github.com/ome/omero-iviewer/pull/422))
- Upgrade many dependencies, including webpack 5 ([450](https://github.com/ome/omero-iviewer/pull/450))

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- Add support for ROI color-picker palette (Thanks to [Michael Barrett](https://github.com/barrettMCW)) ([#415](https://github.com/ome/omero-iviewer/pull/415))
- Rename ?server query parameter to ?host ([414](https://github.com/ome/omero-iviewer/pull/414))

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- Make app compatible with Django 1.11.x and 3.2.x ([399](https://github.com/ome/omero-iviewer/pull/399))

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- Pin omero-web version to 5.14.0 [403](https://github.com/ome/omero-iviewer/pull/403)

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- Improve support for units [386](https://github.com/ome/omero-iviewer/pull/386)