libtorc-core: Fix TorcHTTPServer compilation without libdns_sd
libtorc-core: Don't try and filter services in TorcBonjour

- leave it to the 'client' - who knows best
libtorc-core: Add a global UUID to TorcLocalContext
libtorc-core: Add some static TxtRecord methods to TorcBonjour
libtorc-core: Append the applications UUID to the bonjour registration
libtorc-core: Add TorcNetworkedContext

- intended as a sister class to TorcLocalContext
- initially simply browsers for other uniquely identifiable Torc
applications on the network
libtorc-core: Simplify TorcBonjour::Register method