Allow background images in `LogoTitleCard`

[CollinHeist]

Suggested on the Discord, the LogoTitleCard should support background images, ideally with optional blurring.

Example:

To be backwards compatible, the background image will have to be manually enabled via extra. In addition, blurring should blur the logo by default (also for backwards compatibility), so which "layer" is blurred should also be adjusted via extra. Possibly

extras:
  use_background_image: true | false # Default false, override any background color specified
  blur_only_image: true | false # Default false, only applies if blur modifier or extra is provided