Add "Declare" keyword for interfaces for consistency

[Mistrel]

We can already declare function return types like this:

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Declare.s name()
Procedure.s name()
Prototype.s name()

Interfaces are kind of weird in that you have to declare the return type after the function name:

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Interface ISomeInterface
  name.s()
EndInterface

For consistency, it would be nice to see something like this instead:

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Interface ISomeInterface
  Declare.s name()
EndInterface

I'm already conditioned to look on the left side for the return type. Examining interfaces is a jarring exception.