[Differential] [Updated] D2526: [client] Track all created Outputs and add static get method

[Martin Gräßlin]

graesslin added a dependent revision: D2528: Add support for Surface 
enter/leave events.

REPOSITORY
  rKWAYLAND KWayland

REVISION DETAIL
  https://phabricator.kde.org/D2526

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To: graesslin, #plasma_on_wayland
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas