Profile Manager: Set custom avatar icons and custom profile backgrounds

[2mustange]

In Nightly we have a new Profile Manager,

The profile colors are determined by the "theme" color, which I think is great for the default functionality. I like my theme to be dark mode so all my profiles will be "black/dark" as the profile background, but I would like to see the ability to customize it with my own background image and also my own profile avatar.

Example scenario: Setting a work profile, I would be able to set the avatar to the companies logo and the profile background would be set to a banner.

[Jon]

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