Added curried parameter groups for nested functions

[7sharp9]

This works much the same way as GetMethods in that only the types are involved in the function are used. See the comment in service.fs line 170:

// ValReprInfo = None i.e. in let bindings defined in types or in local functions
// in this case use old approach and return only information about types

In this instance we use stripFunTy to produce the function argument types, and then in the for loop we use if isTupleTy and tryDestTupleTy if the argument is a tuple.

This produces the same CurriedParameterGroups as if the function was in a module binding i.e.

let test one two three =
   one + two + three

This would be:

IList[IList[parameter1]
      IList[parameter2]
      IList[parameter3]]

let test (one, two, three) =
   one + two + three

This would be:

IList[IList[parameter1;parameter2;parameter3]]

[7sharp9]

@dsyme I added tests for this one now :-)

[7sharp9]

Does this look good to merge now?

[dsyme]

This case would return empty

[7sharp9]

I kept the fail with as thats how unmatched results were represented before. Empty would be better than a fail though.

[7sharp9]

@dsyme I think Ive addressed all the points.

[7sharp9]

Anything else to do here?

[haf]

+1 to this PR, see https://bugzilla.xamarin.com/show_bug.cgi?id=27452