CGI Scripts as SynthControl Clients

Warning! These clients use the old SynthControl protocol, not the new OpenSoundControl protocol.

We have written CGI scripts that act as SynthControl clients, sending control messages to a synthesis server.

This was implemented with the sendSC program in its command-line mode. The CGI script constructed invocations of sendSC with command-line arguments to send specific messages, and the sendSC program did all the actual communicating with the synthesizer.