.arcconfig

dirstatemap: conclude `reset_state` with logic using the new __init__

Now the DirstateItem can deal with most of the logic related to its
initialization, our goal is to migrate the function to a more "unified" way were
minimal processing is done early before more generic code gets into play.

Nobody is calling this code yet, but this is about to change.

Differential Revision: https://phab.mercurial-scm.org/D11322

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