Simplify type system

[pravdomil]

Sum types - OR there is ONE way how to define: type

Product types - AND there are MANY ways: () (a, b) (a, b, c) { x: a, y: b } type A = A a b

Let's simplify it If I want OR I use type and |. If I want AND I use {}.

So remove tuples unit is {} variant has only one argument { model, Cmd.none } is the same as { a: model, b: Cmd.none }

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[mitchellwrosen]

Sorry, 👎 to breaking changes from me.

[bburdette]

why would we do this and break practically every elm package.