proxy-messages for SMi
trying to catch keyboard interrupt
simplified paths for pdserver
debugging output
allow to removeAll() callbacks from OSC-cbmanager
we will not need the smi2process helper
allow removing of all callbacks to client/server

via a removeAll() method that get's forwarded to the addressmanager
register proxy callbacks for each SMi
remove unused private callback()

it's an implementation detail of the child-classes
allow specifying which proxies to register

and renamed registerProxy4SM() to registerProxies()
set fallback-callback for proxies

to avoid errors for vanished SMis
automatically register proxies

whenever
- the proxy-settings have changed
- a set of SMis has been scanned/detected