RFC: centralise registries

[Robert Collins]

So at the moment our registries are distributed across the code base.
This is good for locality of content.

But sadly, it means that a plugin extending (say)
bzrlib.tests.parallel_registry, has to load the bzrlib.tests module, and
this module isn't the cheapest.

We could make all the modules that have registries cheap to load, or we
could move all the registries to bzrlib.registry, which is easier to do
as we don't need to deal with subclasses or other such things happening
there.

-Rob
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