Rename FV related functions
This is from Simon's suggestion: * `tyCoVarsOfTypesAcc` is a terrible name for a function with a perfectly decent type `[Type] -> FV`. Maybe `tyCoFVsOfTypes`? Similarly others * `runFVList` is also terrible, but also has a decent type. Maybe just `fvVarList` (and `fvVarSet` for `runFVSet`). * `someVars` could be `mkFVs :: [Var] -> FV`.
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