[MERGE][1.14] simplify the content filter registration API

[John Arbash Meinel]

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Ian Clatworthy wrote:
> John suggested this on IRC and Jelmer has agreed it's a good idea.
> We want this cherrypicked into 1.14 so that the API for plugins is
> stable going forward.
> 
> Ian C.
> 

BB:approve

- From me, you'll have to get sign-off from Bob to get it into 1.14.

John
=:->

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