D22887: WIP: Load animation speed from new global animation speed controller

davidedmundson created this revision.
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REVISION SUMMARY
  It doesn't belong with advanced compositing settings as it's quite user
  friendly, and we also want to adjust other animation speeds. May as well
  do it together.
  
  Migration is still TODO
  
  For the compositing KCM, I was going to port it to use the new location and then 
  hide the slider if we're on a different desktop to Plasma.
  
  See D22885 <https://phabricator.kde.org/D22885>
  
  In the current form all compositing is still completely reinitiliased
  like with the previous slider. Change notifications come in the form of
  KConfigWatcher rather than our own bespoke update interface.

TEST PLAN
  Moved new slider, minimised a window.
  It still behaved as expected.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22887

AFFECTED FILES
  composite.cpp
  kwin.kcfg
  options.cpp
  options.h

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