The existing scribble/acmart language in this repo felt more like latex than Scribble. This package brings scribble/acmart more inline with the existing `scribble/acmart` package that was already on the package server. In particular, this commit:
* Remove maketitle from scribble/acmart
* Extends the title form to also have the fields in `scribble/base`'s title.
* Support author information. (Like scribble/sigplans authorinfo)
* Removed unneeded functions now redundant due to the author function. Namely, affiliation based ones.
* Factor out common functions to scribble/acmart and scribble/base into private module.
These functions might make sense to be public, but since they were already private in base
I thought it made sense to leave them that way. Additionally, it might make sense to have the
file be something other than private/tag, as private/tag currently requires tag, which is
different than the normal way where its tag that requires private/tag.
* Add short-title to scribble/latex-properties
* Adds an `command-optional` property which is like `command-extras`, but is a single
optional argument placed before the mandatory ones.
* Create email, affiliation, and institution structs so that authors can have multiple of each.
* Add/improve documentation and history (and bump version number).
Certain lifted reference forms carried the prefix of the original
section, but in general the section needs to be similarly carried for
rendering elements that may contain references.
Also, fix the contract on `elemref` and `elemtag` to use
`taglet?` instead of `tag?`.
Thanks to Dupéron Georges.
