Convenient wrapper for vl-print-to-file.
The basic idea of this is that you can do, e.g.,
(with-ps-file "my-file.txt" (vl-print "Hello,") (vl-println "World!"))
And end up with a file called
(with-ps-file filename &rest forms)
Basically we just wrap the
This implicitly takes, modifies, and returns state.