A way to retrieve/print MAPINFO's "Author" property in ACS

[Xaser]

Looks like it's possible to retrieve the new-ish "Author" mapinfo property in ZScript, but I'm not seeing a way to do it in ACS. Something similar to PRINTNAME_LEVELNAME (as documented on the wiki here) would to the trick.

For context, I'm working on an older project that uses a LOADACS script to the mapname & author at the beginning of the map, and I'd like to just move the currently-hardcoded author name out of the script to MAPINFO where it belongs. I'll probably end up porting this to ZScript for brevit's sake, but it would've been handy to just be able to do a one-line change here.