Find missing "this" and "This"

[davidhesselbom]

In situations like

Foo: class {
    x: Int
    hello: func { println("hello" }
    world: static func { println("world") }
    init: func {
        x = 3
        hello()
        world()
    }
}

detect the missing this and This. It should be

        this x = 3
        this hello()
        This world()