add support for audio cds

Registered by Patrick Ulbrich

Basenji should be able to index audio cds.
Implement the necessary classes (i.e. derive from existing volume, item, scanner... base types) and fetch track metadata from the musicbrainz webservice (see http://musicbrainz.org/doc/Musicbrainz_Sharp).

Blueprint information

Status:
Complete
Approver:
None
Priority:
High
Drafter:
None
Direction:
Needs approval
Assignee:
Patrick Ulbrich
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Patrick Ulbrich
Completed by
Patrick Ulbrich

Related branches

Sprints

Whiteboard

(?)

Work Items

This blueprint contains Public information 
Everyone can see this information.