Add plugin support for loaders.#3657

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rhattersley wants to merge 3 commits intoSciTools:mainfrom

rhattersley:extensible-loaders

Commits on Feb 14, 2020

Add plugin support for loaders.
rhattersley
committed

Commits on Feb 16, 2020

Try to fix namespace package creation.
rhattersley
committed

Commits on Feb 17, 2020

Run changes through black
rhattersley
committed