D16987: Recalculate connected hash only on change and emit signal

[Roman Gilg]

romangg created this revision.
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REVISION SUMMARY
  Instead of recomputing the connected outputs hash on every access, store
  it in Config and only recalculate it on a change of one of its inputs.
  
  Also inform consumers about the change via a separate signal.

TEST PLAN
  Autotest extended.

REPOSITORY
  R110 KScreen Library

BRANCH
  configConnectedOutputsHashChanged

REVISION DETAIL
  https://phabricator.kde.org/D16987

AFFECTED FILES
  autotests/testscreenconfig.cpp
  src/config.cpp
  src/config.h
  src/output.cpp
  src/output.h

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