`this`-related changes + new String.normalize overload in core.d.ts and es6.d.ts#7664

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Arnavion wants to merge 6 commits intomicrosoft:masterfrom

Arnavion:lib-d-ts-fixes-2

Commits on Mar 24, 2016

{Map, WeakMap}.set and {Set, WeakSet}.add return `this`.
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{Map, Set}.forEach get `this` for the self-parameter.
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{Array, TypedArray}.{copyWithin, fill, sort} return `this`.
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Array and TypedArray methods get `this` for the self-parameter.
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Update tests and baselines.
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Add string literal union type overload for String.normalize parameter.
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