scribble/acmart + biblatex

acmart supports biblatex, see section 2.14.2 of the docs:

https://portalparts.acm.org/hippo/latex_templates/acmart.pdf

`scribble/acmart` will need to configure the right options and include biblatex files:

```
acmauthoryear.bbx
acmauthoryear.cbx
acmdatamodel.dbx
acmnumeric.bbx
acmnumeric.cbx
```

that's all, i think.