Ability to change list icons

[aurooba]

Being able to change list icons would be really handy! Maybe choose from a small selection or upload a small svg.

[aurooba]

Such a good idea, but this is far more nuanced than I was first initially thinking.

• What file types should be supported?
• Should there be a small set of icons packaged with the block?
  • If so, what types of icons make the most sense? Is there documentation or work done by others that indicates the kinds of icons people often want?
• Is the list with icons for markers unordered? Ordered? Are both options possible?
• Should you be able to select an icon per Super List Item? Or is it one icon per Super List?
• Should there be fill colour support, so you can adjust the colour of the icon on the fly?
  • Again, is this per Super List Item or one colour per Super List?

A basic feature on the face of it, but not so basic once you start thinking it though.

[aurooba]

So here's my current thought – I won't support custom images for now. But we can support the list icons that are available through list-style-type! Values to use can be seen here: https://developer.mozilla.org/en-US/docs/Web/CSS/list-style-type