first pass at a test tool for audio config dialog that plots input to a little screen...

first pass at a test tool for audio config dialog that plots input to a little screen.  Just rx in at this stage.  Some indication that it is occasionally unstable.  Might need to convert to async/callback model

git-svn-id: https://svn.code.sf.net/p/freetel/code@967 01035d8c-6547-0410-b346-abe4f91aad63