Add mosaic view for profiles

[earth-walker]

Add an option in app settings that will enable the mosaic view (post previews shown in oroginal aspect ratio, not cropped to 1:1) when viewing profiles.

Personally I think this should be the default as it respects the artist's intentions more than cropping all their images into squares.

[realpixelcode]

Exactly that! I never understood how anyone could actually like a layout that destroys both landscape and portrait images.