Previously, the timecreated for the first step of any question attempt
was set to the current time when the quiz attempt was created. With quiz
attempts being pre-created, this means the question attempts looking
like they were started before the quiz attempt. It also limits the
ability to analyse when a student actually started each question.
This change adds a new class constant,
question_attempt_step::TIMECREATED_ON_FIRST_RENDER. Passing this to the
question_attempt_step constructor will cause the timecreated to be set
to the time when the question attempt is first rendered, rather than
when the step is created.
Mark Johnson
9dee9c9917