Split Variant into its own package?

[woehr]

I discovered Variant from http://hsyl20.fr/home/posts/2018-05-22-extensible-adt.html and am going to be experimenting with it. However, it would be nice to be able to use it without getting all of the other things in haskus-utils.

[hsyl20]

I have just split the package into 4 packages. The new haskus-utils-variant package has much less dependencies.

[woehr]

Thanks!