D21226: search for a default wallpaper in lookandfeel

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  now look and feel packages can specify a default image wallpaper.
  when a new containment is created at first plasma start or at activity creation
  search for a default wallpaper inthe order:
  look and feel package
  if fails, from the plasma theme
  
  we are sure to find a default after it as if neither of those specify one,
  the wallpaper specified by the breeze plasma theme (Next) will be used

TEST PLAN
  tested to start plasma with an empty config file with different themes
  that do or don't include wallpapers

REPOSITORY
  R120 Plasma Workspace

BRANCH
  mart/wallpaperFromLnf

REVISION DETAIL
  https://phabricator.kde.org/D21226

AFFECTED FILES
  lookandfeel/contents/defaults
  wallpapers/image/image.cpp

To: mart, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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