D24944: [scripting] Provide conversion functions for AbstractClient

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REVISION SUMMARY
  If no conversion functions are provided for a QObject-subclass, then
  QScriptEngine will use QScriptEngine::newQObject() method without any
  special options to convert an instance of that QObject-subclass to a
  QScriptValue. However, it's very important that every client object is
  wrapped with PreferExistingWrapperObject option. We need that option
  because a script may set a property on a client object and that property
  must remain until it's deleted by the script.
  
  BUG: 413044
  FIXED-IN: 5.17.2

TEST PLAN
  New test.

REPOSITORY
  R108 KWin

BRANCH
  fix-minimize-all

REVISION DETAIL
  https://phabricator.kde.org/D24944

AFFECTED FILES
  autotests/integration/scripting/CMakeLists.txt
  autotests/integration/scripting/minimizeall_test.cpp
  scripting/meta.cpp
  scripting/meta.h
  scripts/CMakeLists.txt

To: zzag, #kwin
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