Add options for downloading additional game attributes.

[SethG911]

Is your feature request related to a problem? Please describe.
It would be nice to be able to pull down the game text (description), splash (marquee/title), cartridge, and preview (screenshot) to the device as well. I am specifically on muOS, but this would be useful for all the other CFWs as well.

Describe the solution you'd like
Replace the option of "Download Artwork" with multiple items:

• Download Box2D (would have to choose 2D or 3D or Miximage, not all together)
• Download Box3D
• Download Miximage
• Download Marquee
• Download Physical (map to Grid maybe?)
• Download Screenshot (would have to pick between this and Title Screen)
• Download Title Screen
• Download Descriptions

Additional context
Here's documentation of how these images and text descriptions are mapped in muOS specifically.
https://muos.dev/installation/artwork

[BrandonKowalski]

What theme are you using and what theme settings do you have enabled?

I want to test what you are using as I don't use these features.

[pawndev]

These could be useful for Knulli too, in the gamelist I don't fill the marquee, box, video etc. at this moment, I'll take a look after #78 if we can add settings per OS

[pawndev]

And for rocknix too, just add this comment to remember myself to take a look at it