Right now if someone or a room doesn't have an avatar, there's a good
chance it will end up falling back to the NeoChat app icon (not very
descriptive.) It also tends to break the flow of conversations, that's
the whole reason to have an avatar in the notification in the first
place.
So I made it render a similar-looking avatar like it does in-app, by
re-implementing it in QPainter. I also took the time to refactor and
clean up the avatar generation for notifications so the logic should be
easier to follow.
To reduce the maintenance required, we re-use some functionality from
Kirigami Add-ons. The rest of the drawing logic is custom but sensible,
but some creative liberty was used to ensure it looks decent.
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