more printing changes.

move log operations into their own file, since they're used outside of
pkg_add/pkg_delete by pkg_check.

move all system stuff to State, so that printing can be localized/controlled.
Create primitives _print, _errprint, _fatal for overriding output, without
localization.

Accordingly, move a lot of code out of Error. We should also move Unlink and
Copy eventually.

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