Support reading tags from Ogg Opus files

https://bugzilla.gnome.org/show_bug.cgi?id=692389
Support for writing tags to Ogg Opus files

https://bugzilla.gnome.org/show_bug.cgi?id=692389
Fix reading header information from Opus files

Correctly read the sample rate and duration from Opus files.
Additionally, handle images in an Opus comment.
Update AppData for Opus file support
Error out if Ogg disabled but Speex/Opus enabled

Opus and Speex support depend on Ogg support for parsing of Vorbis
comments, used in both formats.