CustomEmitter/Affector now affect whole lists at once

Better performance potential (fewer drops to JS, possibility of more
optimzed JS).

Change-Id: If386f06ac8714162a5bfc6b5eef7f2e67f9dae95
Reviewed-on: http://codereview.qt-project.org/5189


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Martin Jones <martin.jones@nokia.com>