WIP for generic representations of ADTs

[andyscott]

This is an early stage WIP for generic derivation using iota. For now, I'm able to get a type level representation of case classes.

case class Dummy(
  a: String,
  b: Double,
  c: Long)
 
val gen = TList.Gen[Dummy]

And here's the generated instance for gen:

[info]   final class $anon extends _root_.iota.TList.Gen[iotaexamples.Foo.Dummy] {
[info]     override type Repr = iota.TCons[String with iota.gen.Meta[Int(0), String("a")],iot
a.TCons[Double with iota.gen.Meta[Int(0), String("b")],iota.TCons[Long with iota.gen.Meta[Int
(0), String("c")],iota.TNil]]]                                                              
[info]   };
[info]   new $anon()
[info] }
[info]   val gen = TList.Gen[Dummy]

There's a lot more to do. And currently there is no way to map to a value level representation in an iota.Prod instance.