[Types-sig] Another cut at Sequence declarations

[Paul Prescod]

I think you're making good progress Tim! I'd appreciate it if you could
finish the major protocols: Sequence (Mut/Unmu), Mapping (Mut/Unmu),
ReadFile, WriteFile. I'll move the interfaces you define into my module
and we'll put the base classes into some kind of basic types module for
clarity.
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