scripting: Port kwin from QtScript to QJSEngine

Vlad Zahorodniirequested to merge
work/qjsengine-scripts into master

QtScript is not well maintained and deprecated in favor of QJSEngine.

See also https://phabricator.kde.org/D14536 and https://phabricator.kde.org/D20640

Edited by Vlad Zahorodnii

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