Support Sony ARW Raw files

[Webreaper]

Example file https://github.com/Webreaper/Damselfly/files/7584245/20210728-182129-2.ARW.zip

SkiaSharp and ImageSharp don't support ARW, so to get support it'll have to be through ImageMagick. However, imagemagick supports ARW via ufraw, which is no longer supported.

So the answer is to:

1. Add dcraw support into the damselfly base image [done]
2. Update the delegates for ImageMagic