doc: Switch protocol, format and codec

The following changes are included in this commit:

- multicast to unicast
- UDP to TCP
- Matroska to ogg
- MP3 to FLAC

Switching to these protocols has several advantages. Avoiding multicast
makes it unnecessary to care about the available multicast addresses in
the local network. Unicast addresses are anyway assigned by DHCP. In a
multi-room setup this has of course the disadvantage that the same data
might be streamed via separate connections. The bandwidth requirement
would be multiplied by the number of soundbox devices. But since a
stream takes around 2 Mbit/s and we live in a world where 100 Mbit/s in
a local network should not be a problem the inefficiency can be
neglected.

Switching from UDP to TCP has the advantage that the stream is
transmitted reliably. Furthermore it avoids the situation that multiple
clients stream to the same soundbox simultaneously since a
single-connection TCP server is used.

The switch from Matroska to ogg is done because the ogg format is
recommended on the FLAC homepage. FLAC is used instead of MP3 because it
is a lossless audio compression format. This is obviously superior
compared to the lossy MP3 format regarding audio quality.

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