D24862: Port one of session management connections state to a custom API

[David Edmundson]

davidedmundson added a dependent revision: D24864: [effects] Add effect to hold the desktop window static after plasmashell quits

When a plasma session quits, the order of plasmashell and clients quitting
is undetermined. This looks bad as our desktop background disappears quite early.

Rather....

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D24862

To: davidedmundson, #kwin
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