Reading Opus with opusfile

This convenience library is a little too limited and doesn't write
files, so we're going to have to write our own libogg+libopus code.
Some other worthy changes made here too.
Opus stereo writing working

Just a quick save before I add the surround stuff.
Opus surround working

Also, parameters have been added
Xcode projects updated for Opus
Git rid of another file in Xcode project
Opus Visual Studio projects added