Update Resources.resw so git doesn't annoy me

- The WinRT client has been superseded by the portable and store clients,
  so we should probably just remove this project.
Always subscribe to all ACKs on all servers

Prior to this fix, Groups.Add would fail to complete when there was no
subscription configured to receive the ACK on the server Groups.Add was
called on.
Prevent stack overflows when a Hub implements IHub

#3228
Make Hub<T>.Clients settable for testing

- Setting Hub<T>.Clients to null will really set it to its default value

#3299
Only initiate the WebSocket closing handshake on the client

#3342
Revert "Added test to verify that WindowsIdentities are usable in OnDisconnected"

This reverts commit e1b1de6f5f59aa2058a8795d3201230d00736ab9.
Revert "Stop processing messages before ending the WebSocketFunc Task"

This reverts commit 654bfb4198c7f20c49c068335c29d47c5011cb97.