Replace @IMPORT_QT_QUICK@ with "import QtQuick 2.0"

Replace @IMPORT_QT_QUICK@ with "import QtQuick 2.0"

QFSFileEngine and QAbstractFileEngineHandler are not available in Qt5
We will hardcode import QtQuick 2.0 to make Qt5 happy and will replace
it with QtQuick 1.1 when not using Qt5