D16992: Introduce secondary control channel of the KScreen daemon

[Roman Gilg]

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REVISION SUMMARY
  Kcm and daemon can only communicate a limited data set through the backend.
  This feature patch adds an additional level of control by providing a one-way
  control channel through output and configuration control files.
  
  The first property to be controlled through this channel is the output
  retention. Other information shared in the future might be if a certain
  resolution or refresh rate was manually set by the user or is the result
  of an algorithm, so that the daemon on next startup can decide to recompute
  the optimal value.

TEST PLAN
  Autotests updated, such that they are controled for now to only use
  indvidual retention.

REPOSITORY
  R104 KScreen

BRANCH
  0controlRetention

REVISION DETAIL
  https://phabricator.kde.org/D16992

AFFECTED FILES
  kded/CMakeLists.txt
  kded/config.cpp
  kded/control.cpp
  kded/control.h
  kded/output.cpp
  kded/output.h
  tests/kded/CMakeLists.txt
  tests/kded/configtest.cpp
  tests/kded/serializerdata/control/configs/229fa9e8a378cb151d7302df42666774
  tests/kded/serializerdata/control/configs/8684e883209d7644eb76feea2081c431
  tests/kded/serializerdata/control/configs/e919cc0dd7aea8d8f519bdf8b93a6f69

To: romangg, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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