LibCore: Port CoreIPCServer to using CLocalServer.

Use CLocalServer to listen for connections in WindowServer and AudioServer.
This allows us to accept incoming CLocalSocket objects from the CLocalServer
and construct client connections based on those.

Removed COpenedSocket since it's replaced by CLocalSocket.

Servers/WindowServer/WSClientConnection.cpp

@@ -39,8 +39,8 @@ WSClientConnection* WSClientConnection::from_client_id(int client_id)
     return (*it).value;
 }
 
-WSClientConnection::WSClientConnection(int fd, int client_id)
-    : Connection(fd, client_id)
+WSClientConnection::WSClientConnection(CLocalSocket& client_socket, int client_id)
+    : Connection(client_socket, client_id)
 {
     if (!s_connections)
         s_connections = new HashMap<int, WSClientConnection*>;