Re: [heycam/webidl] [wip] First pass at adding internal slots (#495)

So just to clarify, the 3 options @jyasskin refers to above were discussed on irc and are:

1. The above proposal:
    ```
    interface I {
      [[aSlot]]; // custom slot
      readonly attribute DOMString foo; // has a [[foo]] slot.
      attribute DOMString innerHTML; // has a [[innerHTML]] slot, never uses it.
    };
    ```
    
2. @domenic's option (opt-in):
    ```
    interface I {
      [[aSlot]]; // custom slot
      [Slot] readonly attribute DOMString foo;  // has a [[foo]] slot.
      attribute DOMString innerHTML; // has no slot.
    };
    ```

3.  Ruby-style:
    ````
    interface I {
      [[aSlot]]; // custom slot
      [[anotherSlot]]; // another custom slot used below
      [Reflect=anotherSlot] readonly attribute DOMString foo; // reads from [[anotherSlot]]
      attribute DOMString computedAttr; // has no slot.
    };
    ```

To which I'll add @annevk's option:

4. @annevk's option (opt-out):
    ```
    interface I {
      [[aSlot]]; //custom slot
      readonly attribute DOMString foo; // has a [[foo]] slot.
      [NoSlot] attribute DOMString computedAttr; // has no slot (duh!)
    };
    ```


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