[MERGE] Create a single registry of all Hooks classes, removing the test suite knowledge of such hooks and allowing plugins to sensibly and safely define new hooks.

[John Arbash Meinel]

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Robert Collins wrote:
> This allows easier creation and listing of Hooks. It will allow
> generated docs and allow plugins to create new Hooks.
> 
> -Rob
> 

BB:approve

John
=:->

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