Make client capability table to clean up parts of the registration code
Cache CAP LS output
Rename c_hunted to c_generic
Process s2s AWAY, and propagate /AWAY from users (move to c_generic)
sendto: Only update cookie if we actually send to this connection
Use entities to assist in PING/PONG routing
Alter end-of-burst detection test slightly
Include `me' in servers_by_{name,sid} tries