[PD] Scheme for Pd 0.1 beta release

[Iain Duncan]

Hi everyone, I'm excited to announce that Scheme for Pd  (aka s4pd) is now
code complete for version 0.1 and ready for people to use, though it does
still require building from source at the moment. This should "just work"
with the Makefile, let me know if not.

Scheme for Pd is an open-source external for live-coding and scripting Pd
with an embedded s7 Scheme Lisp interpreter. It is a port of most of Scheme
for Max, also by me, for Max/MSP. s7 is an embeddable minimal Scheme
implementation by Bill Schottstaedt at CCRMA, with many nice features for
algorithmic composition and embedding. It's the Scheme engine used in the
Common Music algorithmic composition toolkit and the Snd audio editor, and
has keywords, Common Lisp style macros, first-class environments, thread
safety, applicative syntax, and a very straight forward FFI (foreign
function interface).

Features in beta 0.1:
* run code from files, and hot reload files during playback
* evaluate scheme code from Pd messages live with a REPL
* keeps on playing fine when you go into edit mode
* output numbers, symbols, lists, vectors (as Pd lists)
* basic array i/o
* send messages to named receivers
* schedule functions with delay, using the Pd scheduler

The GitHub project page is here. Please file issues there if you find bugs
or the help is unclear. I'm sure there are still some issues!
https://github.com/iainctduncan/scheme-for-pd

If you've not used Scheme before, I've written a crash course for Scheme
for Max which should almost all apply here:
https://iainctduncan.github.io/learn-scheme-for-max/introduction.html

There are various videos on the youtube channel demoing things you can do
with the Max version, which might be of interest, as they should mostly
port over without issue. I will be making Pd specific ones in the future.
https://www.youtube.com/channel/UC6ftX7yuEi5uUFkRVJbJyWA

If you can help with testing and making builds on Windows and Linux, please
let me know. I think this version should be ready for a binary release now.

Enjoy,
iain
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