Support SVG Favicons

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Is your feature request related to a problem? Please describe. SVG Favicons are supported by a wide variety of browsers. As with the other images supported by the Theming app, it would be preferable to avoid converting SVG images used as favicons and instead leaving them as is.

Describe the solution you'd like SVG Favicons to not be converted and instead used directly.

Describe alternatives you've considered n/a

Additional context Features such as light/dark theme support require SVG images to utilise CSS' prefers-color-scheme feature.