Initial commit of PCF
This is not yet working due to not being able to define the least upper bound of two Interp arrows. For this reason the tests of the sign and interval semantics have also not been run on this new version where the shared interpreter abstracts over value types. As you can see in pcf/src/Shared.hs, we can also remove the definition of ArrowFail with the one from lib/src/Data/Fail.hs, perhaps extract ArrowFix into its own file in lib/src/Data as well and perhaps remove a functional dependency in IsEnv.
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