Add documentation!
add the plugin_config attribute

aka "all configuration data provided by plugins".
...and promptly rename to 'dynamic_config'

This name makes more sense to me, but 'plugin_config' had already started
appearing in the document; here we get to change it consistently, and all at
once.
finalize(!) _build_config()

...for now, at least.
more documentation
rename static_config -> store_config

Hopefully this will make things a little clearer as to where this comes from,
even to the casual observer.
add a small 'TODO' comment in Consumer w.r.t. Role::RegisterStash

Not yet.  But soon.
::Role::GitStore::Consumer doc
::Role::GitStore::ConfigProvider doc
::Role::GitStore::ConfigConsumer doc
v0.000002

	* Add some actual documentation!
	* rename static_config -> store_config
	* finalize(!) _build_config()
	* add the plugin_config attribute
	* ...and promptly rename to 'dynamic_config'