Resolve "Replace model icon choices with new icon set"

Closes #674 (closed)

assigned to @ZugBahnHof

added 3 commits

• e5ba309b - Use icon choices from django iconify
• 82d64f83 - Use new icon set in footer menu
• 90e8199f - Limit icon sets to mdi

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added 1 commit

• 816150a4 - Increase version of django-iconify

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@ZugBahnHof Concerning the updates of models:

1. Check all locations in the Core where models can be selected, and change them to use the new icon set
2. Implement a data check for all concerned models. It shall check whether an old or a new icon is selected, and if an old icon is slected, raise a data check error. Consult with @hansegucker to find out how.
3. Open an issue in Hjelp in the %"2022.6 — "Cohn"" milestone to do the same there (and preferrably, do it there)

assigned to @nik and unassigned @ZugBahnHof

added 2 commits

• 6ce723dd - Develop NotUpdatedIconChoicesDataCheckBuilder to dynamically create data...
• 447efe98 - Apply data check to icon field of CustomMenuIcon

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added 1 commit

• bf145235 - Generalise icon validation factory to field validation factory

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resolved all threads

added 2 commits

• 6570f305 - Add absolute_url to CustomMenuItem
• b07611c5 - Update CHANGELOG.rst

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• 1e368a85 - Set ICONS to empty list if icon set is not installed

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marked this merge request as ready

added 1 commit

• 328ea92f - Reformat

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merged

mentioned in commit 2abc196e