D5381: Add brightness control using ddcutil lib

[Dorian Vogel]

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

REVISION SUMMARY
  Setting up ddcutil <http://www.ddcutil.com/> for non-root CLI use is required first. 
  Please refer to https://github.com/d-vogel/QMLddcutil/blob/master/README.md <https://github.com/d-vogel/QMLddcutil/blob/master/README.md> section.
  
  Limitations:
  Not tested for multiple DDC capable monitors setup, should only change brightness of first monitor anyway.

REPOSITORY
  R122 Powerdevil

REVISION DETAIL
  https://phabricator.kde.org/D5381

AFFECTED FILES
  daemon/backends/CMakeLists.txt
  daemon/backends/upower/ddcutilbrightness.cpp
  daemon/backends/upower/ddcutilbrightness.h
  daemon/backends/upower/powerdevilupowerbackend.cpp
  daemon/backends/upower/powerdevilupowerbackend.h

To: dvogel, broulik
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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