D22218: Use new slot syntax in Compositor class

romangg created this revision.
romangg added a reviewer: KWin.
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REVISION SUMMARY
  As a preparation for further changes clean up the Compositor
  class. First step is to use the new slot syntax and rename
  some of the slots.
  
  Includes some other minor code style improvements to the class
  as well.

TEST PLAN
  Manually in X and Wayland nested session.

REPOSITORY
  R108 KWin

BRANCH
  compositorSlotSyntax

REVISION DETAIL
  https://phabricator.kde.org/D22218

AFFECTED FILES
  composite.cpp
  composite.h
  kwinbindings.cpp
  workspace.cpp

To: romangg, #kwin
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