Add switch statement

[IAmCheeseman]

with either of these syntaxes:

switch h {
    case "h" {
        println(h)
    }
    default {}
}

or

switch h {
    case "h":
        println(h)
    default:
        code()
}

[Dot32Dev]

I like them the first syntax for the switch statement, but perhaps the : syntax could be for single liners
Given that we can do let variable = if {} it also would make sense to have let variable = switch {}