Allow regular expresions in endpoints friendcode.

[rockneurotiko]

Adding regular expresions, or some general expresions (like *) could be useful in some widgets, for example the spy-wiring accept any in their input/output endpoints.

[aarranz]

We have to investigate if regular expressions are useful for friendcodes. But, yes I agree with you that at least we need an special friendcode for matching any connection. Probably any or *.