LibIPC: Rename base classes to IClientConnection and IServerConnection

This matches what we're already calling the server-side subclasses
better, though we'll probably want to find some better names for the
client-side classes eventually.

Servers/WindowServer/WSClientConnection.cpp

@@ -42,7 +42,7 @@ WSClientConnection* WSClientConnection::from_client_id(int client_id)
 }
 
 WSClientConnection::WSClientConnection(CLocalSocket& client_socket, int client_id)
-    : ConnectionNG(*this, client_socket, client_id)
+    : IClientConnection(*this, client_socket, client_id)
 {
     if (!s_connections)
         s_connections = new HashMap<int, NonnullRefPtr<WSClientConnection>>;

Servers/WindowServer/WSClientConnection.h

@@ -15,7 +15,7 @@ class WSMenu;
 class WSMenuBar;
 
 class WSClientConnection final
-    : public IPC::Server::ConnectionNG<WindowServerEndpoint>
+    : public IClientConnection<WindowServerEndpoint>
     , public WindowServerEndpoint {
     C_OBJECT(WSClientConnection)
 public:

Servers/WindowServer/WSEventLoop.cpp

@@ -37,7 +37,7 @@ WSEventLoop::WSEventLoop()
         }
         static int s_next_client_id = 0;
         int client_id = ++s_next_client_id;
-        IPC::Server::new_connection_ng_for_client<WSClientConnection>(*client_socket, client_id);
+        new_client_connection<WSClientConnection>(*client_socket, client_id);
     };
 
     ASSERT(m_keyboard_fd >= 0);