Use higher-resolution favicons

[David-Development]

Is your feature request related to a problem? Please describe.
In the nextcloud news app for android I'm currently facing the issue that I would like to show the favicon in several places. In some places the favicon will be shown with at least 100x100px. However by nature favicons have a size of only 16x16px. Therefore the icon appears to be blurry. Due to recent developments in web development larger favicons are more common now.

Describe the solution you'd like
Since modern websites usually ship also higher resolutions of those favicons it would be nice if the favicons url for a given feed would already match those high-res icons. Otherwise all client apps need to download the website and extract the high-res link by themself.
I was trying to read through the code but I'm not sure if you update existing favicons regularly or if you only extract the link once while adding the feed. Also I wasn't able to find the code where the favicon factory is coming from. Or is it an external dependency?

For reference on how to extract high-res favicons: https://stackoverflow.com/a/22007642

Describe alternatives you've considered
As I already mentioned, if we stick to the current implementation I'd have to implement it in the android app. Due to the fact that I need to make an additional network call to the website I'd rather do it here where the favicon is extracted anyways.

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[SMillerDev]

It's an external dependency. Check composer.json for the identifier. That should allow you to look it up on packagist.org

[Grotax]

#961

[Grotax]

#1164 fixes this partly but not fully.