Custom icons: allow image URLs in 'icon' fields

[wrdclark]

A couple of ideas for this.

Simple version: compare the entered text against a regexp for images (some ideas at StackOverflow)).

Complicated version: retrieve the header, check for Content-type: image or other suitable values.

[posita]

Is the purpose of this to be able to use hosted images instead of first having to download and install them locally? (I'm just trying to understand the request.)

[wrdclark]

(I am using crobi.github.io/rpg-cards as reference, as I haven’t looked at this in years...)
As I understand it, the Icon field is limited to just searching game-icons.net. If it was possible to use URLs as input, one could use any icon resource, either online (barring any hotlinking issues) or locally saved (via file:// urls).