Feature/location types

[wolflu05]

This PR implements the basic functionality of StockLocation types like proposed in #5561 .

I'm not sure how far PUI is, but as far as I see, there is currently nothing where I could implement this, so it can be done when implementing the stock location forms and settings.

To keep backwards compatibility I renamed the model field (but kept the db field named icon) to custom_icon and added a setter / getter approach to the icon field. But there is one drawback with this setter, if the icon field gets loaded as default value by any form which is later saved, the location no longer inherits its icon from the location type, because the icon is now saved to the location. Let me know if I should remove the setter or if you have a better idea.

Todo

• tests
• bump api version

fixes #5561

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[wolflu05]

This would be ready from my POV. The CI issues are as far as I see related to the exchange host api which currently is not working, see Formicka/exchangerate.host#236

[mlucchelli]

RecursionError: maximum recursion depth exceeded

[wolflu05]

RecursionError: maximum recursion depth exceeded

If you look at other test runs from other branches, you can see that the recursion error is present there too in combination with the two exchange rate tests that are failing.

[SchrodingersGat]

@wolflu05 this looks great, thanks for taking the time to implement this, I think it is a very clean implementation :)