[whatwg/dom] Candidates for AbstractRange (#591)

It seems the following members from `Range` might be suitable to move up to `AbstractRange` so `StaticRange` has them too:

```webidl
  void collapse(optional boolean toStart = false);
  void selectNode(Node node);
  void selectNodeContents(Node node);

  [NewObject] Range cloneRange(); // with s/Range/AbstractRange/
```

The following seems reasonable as well, but would require a substantive change in signature as a `StaticRange` is not guaranteed to have a common ancestor container:

```webidl
  readonly attribute Node commonAncestorContainer; // with s/Node/Node?/
```

cc @rniwa @johanneswilm @bzbarsky @dstorey @garykac

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