D16450: [scripting] Introduce rewind function

zzag created this revision.
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REVISION SUMMARY
  Effects that prefer to manipulate direction of animations sometimes need
  to create animations in some particular state so later on they can be
  played backward (swapping from and to is not enough and it would be wrong).
  
  The proposed rewind function lets such effects to rewind animations to
  desired moments(e.g. to the target of animation).

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D16450

AFFECTED FILES
  autotests/integration/effects/scripted_effects_test.cpp
  autotests/integration/effects/scripts/rewindTest.js
  libkwineffects/kwinanimationeffect.cpp
  libkwineffects/kwinanimationeffect.h
  scripting/scriptedeffect.cpp
  scripting/scriptedeffect.h

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