Parameterize Expr and Reft by the variable type #708
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This PR makes it possible to change the type of variables after they have been resolved. The parameter is always instantiated to Symbol in liquid-fixpoint, but in liquidhaskell it could be instantiated to Name or to Var.
This is not the only way to go about name resolution in LH, but it is convenient to stick to a single representation of refinement types for the time being.