Remove all public references to EventLoop to match changes to async API

examples/example_client.py

@@ -5,20 +5,15 @@ import test_capnp
 import socket
 
 def example_client():
-    loop = capnp.EventLoop()
-    
     c = socket.create_connection(('localhost', 49999))
-    read_stream = capnp.FdAsyncIoStream(c.fileno())
 
-    client = capnp.RpcClient(loop, read_stream)
+    client = capnp.RpcClient(c)
 
-    ref = test_capnp.TestSturdyRefObjectId.new_message()
-    ref.tag = 'testInterface'
-    cap = client.restore(ref)
+    cap = client.restore(test_capnp.TestSturdyRefObjectId.new_message(tag='testInterface'))
     cap = cap.cast_as(test_capnp.TestInterface)
 
     remote = cap.foo(i=5)
-    response = loop.wait(remote)
+    response = remote.wait()
 
     assert response.x == '125'
     c.close()