- Rework RPC dispatch layer to be simpler and not get confused by
  server/client duality.
- Make threads shut down at the right time and not access freed memory
  after apartment destruction.
- Rename stub_dispatch_thread to client_dispatch_thread.
- Add some more tracing
- Check return value of WaitNamedPipe.
- Change named pipe timeouts to 0.5s, which should be enough for even the slowest machines.