realtime-voice-conversion based on last year's work

This is based on the work I did in (July - October)ish 2019 to get real
time voice conversion working. I've removed it from the `voder` library
and made it into an isolable program. I'll work on extending the
capabilities.

Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "voice_conversion_sidecar"
+version = "0.1.0"
+authors = [ "Brandon Thomas <bt@brand.io>",
+            "Brandon Thomas <echelon@gmail.com>" ]
+[[bin]]
+name = "voice_converter_sidecar"
+path = "src/main.rs"
+
+[dependencies]
+byteorder = "1.3.2" # byte-level operations
+bytes = "0.4.12" # required by 'prost'
+cpal = "0.10.0" # hardware audio out
+failure = "0.1.5" # required by cpal
+prost = "0.5.*" # protobuf
+prost-types = "0.5.0" # protobuf
+wavy = "0.1.2" # real time audio capture and playback
+# TODO: Move these into the voder project workspace.
+world-sys = { path = "/home/bt/dev/world-sys" } # AWESOME WORLD VOCODER BINDINGS HAH HA HAH
+zmq = "0.9.2" # zeromq
+
+[build-dependencies]
+prost-build = "0.5.0"