Improve support for transparent and non-rectangle images, icons, and emoji's

Another thing :thinking:

I find it strange that the “profile” layout now has a rounded square border for icons, whereas the icons of that same objects in other part of Anytype like the graph view or in the search or inline mention, etc is still the old circular cut out.

Personally I think having a square or rounded square for “Basic”, and the circular cutout for the “Profile” is more suitable.