[feature request] JSON file that maps set code to keyrune data
Hey, TYSM for this project!

I was hoping we could get a file, probably json, that maps a set-code to different keyrune data points.
Specifically, I'd like a mapping from the set-code to the font's unicode, but this could also be extended for other data-points if need be.

`{
	"STX": {
		"unicode": "E975",
		...
	},
	...
}`

For example in my project all I really want/need is the font files, but without manually entering or parsing your css/html the unicode is unknown.  I'd like to keep these set symbols up-to-date automatically with my current cron-script that keeps my set cache updated.

Thanks in advance!
