D5036: UI fixes for logout dialog

[Marco Martin]

mart created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  - use backgroundcontrast effect, improves readability a lot
  - non-current actions a bit more translucent
  - background is actually black if the color scheme is dark, looks washed out otherwise
  - add an OK button, that was complained a lot
  - short fade animation at the beginning

TEST PLAN
  see screenshot

REPOSITORY
  R120 Plasma Workspace

BRANCH
  phab/logoutpretty

REVISION DETAIL
  https://phabricator.kde.org/D5036

AFFECTED FILES
  ksmserver/shutdowndlg.cpp
  lookandfeel/contents/logout/Logout.qml
  lookandfeel/contents/logout/LogoutButton.qml

To: mart, #plasma, sebas
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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