Using Self within type to call static methods

[kengorab]

Given a type MyType or enum MyEnum, static methods on that type/enum should be callable using the Self type, rather than requiring the whole type be spelled. For example:

type MyType {
  func staticFunc(): Int = 123
  func method() {
    // val num = MyType.staticFunc()
    val num = Self.staticFunc() // <- do this instead
    println(num)
  }
}

This has a couple of implications.

1. Self is effectively keyworded, like self
2. Selfis not a valid type identifier anymore
3. Self cannot be used outside of a method