D15519: Privatize variables in InputDeviceHandler

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REVISION SUMMARY
  Some members were declared protected. Better style is to have them private
  with public or protected getters and setters.
  
  This also removes the unnecessary m_input variable.

TEST PLAN
  Builds and runs.

REPOSITORY
  R108 KWin

BRANCH
  privatizeInputDeviceHandler

REVISION DETAIL
  https://phabricator.kde.org/D15519

AFFECTED FILES
  input.cpp
  input.h
  pointer_input.cpp
  touch_input.cpp

To: romangg, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart