refactor: factor out [generic-list]

Created by  dbohdan  on January 1, 2021

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feat: implement [*] and [1] for lists

Created by  dbohdan  on January 1, 2021

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feat(msubst): pass through processed content

Created by  dbohdan  on January 1, 2021

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Initial commit

Created by  dbohdan  on January 1, 2021

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