Add Bonjour advertisement support in OSCServer

[orchetect]

As per the OSC 1.1 proposal, §5.2:

Services available over IP networks can be located with DNS-SD (aka Zeroconf). These may be listed as protocol _osc._udp or _osc._tcp (with reservations, users may wish to register their own protocol that simply uses OSC). The attributes given in Table 4 are specified in the TXT field for DNS-SD, e.g. suppose we have a bidirectional endpoint over TCP at port 5000:

_osc._tcp.localhost:5000
    txtvers=1
    version=1.1
    framing=slip
    uri=http://myapp.com/
    types=ifsbhdu