literal #1 gets changed to $1 in iemgui label

Because we're aliasing "#n" to mean "$n" in iemgui label/send/receive symbols (where n is an integer), we can't use literal "#n" (again, where n is an integer) inside iemgui labels, send symbols, or receive symbols.

I think we're using an escaping mechanism for dollarsigns for the "Find" functionality. If so, we should extend that same mechanism to iemgui label/send/receive symbols.