[swift-evolution] [Idea] Make lazy an attribute

[Антон Жилин]

One of proposals that will probably be submitted for Swift 4, will be
Property Behaviors propoal.

It aims to generalize @IBOutlet, @synchronized, @delayedinit, and of
course, @lazy.
(Side note: it would be great if it also included unowned)

Because we aim for less breaking changes in Swift 4, we should prepare
ground for it.
The suggestion is to rename `lazy` to `@lazy`.

Besides the aforementioned reason, I think, lazy really has its place among
attributes.
It does not change type of property, it just helps to delay side effects of
initialization.

- Anton
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