D26440: Add KSharedConfig::openStateConfig for storing state information

[Nathaniel Graham]

ngraham added a task: T12549: Remove cache data from config files.

REPOSITORY
  R237 KConfig

REVISION DETAIL
  https://phabricator.kde.org/D26440

To: nicolasfella, #frameworks, dfaure
Cc: broulik, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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