Wren Keycodes

[dollerama]

we need a class in app.wren like this:

class Keycode {
   static W { "W" }
   static A { "A" }
   static S { "S" }
   static D { "D" }
   ...
}

class Mouse {
    static Left { "Left" }
    static Right { "Right" }
    static Middle { "Middle" }
}