[Proposal] rawpairs()

["Soni L." <fakedme@...>]

pairs() is considered harmful, and can cause bugs: 
https://github.com/MightyPirates/OpenComputers/issues/1625

Now, `for k, v in next, t do` is a bit less clear than `for k, v in 
pairs(t) do`, so my proposal is that we get a built-in rawpairs(), as 
`for k, v in rawpairs(t) do` is clear, and it'd be good for new users to 
not be confused when they see it but it fails on their interpreter with 
"attempt to call nil".

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