Re: [dom] Fix #119: Merge DOMSettableTokenList into DOMTokenList (#120)

>From the spec point-of-view this makes sense to me, one can already change the underlying value using `DOMTokenList.prototype.add()`, so also being able to set `value` ought not introduce any new problems in principle.

Implementation-wise, a potential problem is that `DOMTokenList` is actually a virtual base class, with concrete subclasses `ClassList` (not an IDL interface) and `DOMSettableTokenList`. Without actually trying to write the code, it's hard to say if merging these into a single internal representation would cause any trouble, like maybe perf regressions for `classList`.

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