many core plugins do not make use of dump_config

[karenetheridge]

(placeholder, to be replaced with a patch eventually.. if no one else beats me to it -- note to others, this is a nice entry-level piece of work that does not require understanding huge amounts of dzil internals)

Many plugins in the core Dist::Zilla distribution do not make good use of dump_config() to include all their configuration settings in metadata (included in META.* by the [MetaConfig] plugin). Debugging the output of a dist is easier with this, so they should be added.

(Also possibly think about how to extract configs from roles applied to plugins, such as Pod::Elemental::PerlMunger which is applied to [PodWeaver] -- yes I know PodWeaver isn't core -- it would be nice to get the 'replacer' config and friends in the dumped config too, even though the base class itself doesn't know anything about them. Could use some sort of method modifier?)

[rjbs]

This is now #276