[Bug 27178] don't install private headers, and privatize most of the API/ABI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27178

Bug 27178 depends on bug 27773, which changed state.

Bug 27773 Summary: Make debug, util, datetime, action-chain be library-internal
https://bugs.freedesktop.org/show_bug.cgi?id=27773

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
         Resolution|                            |FIXED
             Status|ASSIGNED                    |RESOLVED

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