Add support for Mark hedging question types in Scratchie.
While we support mark hedging in iRAT since 2014 (http://lams2014.lamsfoundation.org/docs/pressos/Implementation%20of%20LAMS%20in%20Team%20Based%20Learning%20(TBL)%20in%20Engineering,%20Science%20and%20Business%20(final).ppt), it will be easier for teachers to be able to add these questions to tRAT in the context of the mighty Question Bank.
So in Scratchie authoring, we should be able to create and import Mark hedging questions directly into Scratchie and these shall map with the iRAT questions, of course.
At the end of the day, mark hedging point allocation it only works for iRAT. tRAT should treat mark hedging question just like single best answer questions (or MCQ).