This is David Richards' support patch for Ogg encapsulated
Opus streams.

From https://github.com/krad-radio/icecast-oneman/commit/35927ca52f8e538eb20d8a185b8c10f1f2e9118a

svn path=/icecast/branches/icecast-webm/; revision=18302

here with xmlChar, based on work originally done by gtgbr@gmx.net.
closes #783, #784, #785, #787

svn path=/icecast/trunk/icecast/; revision=13933

mainly due to client support, but they are only for detection and plug
straight into the ogg handler.
The win32 project files will need updating to take the new files into account

svn path=/icecast/trunk/icecast/; revision=9225