Very basic channel and function type handling

[nicknewland-dev]

Valast has been great, but I have several places where I need it to handle channel or function types gracefully and not just return an error. I have created some very, very basic handling for those types that just converts the channel or function to a basic literal which writes out the type and address of the value.

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[slimsag]

Sorry, but functions and channels are generally out of scope. Valast is used to generate valid Go code, and is used by many to actually write Go code back into a Go source file. The address of the value is not valid for this use case.