This adds the controller actions for the toolbar

[#39902221] My mistake was in assuming the problem was in DryML. In fact, I needed to ensure the controller actions were in place to support the links the tags would create. This does that.
MultipleChoiceSequences have GiveUp and Confirm visual prompts

Might as well add them all. [#39902221]
Making the spec pass (to_hash)
Finishing correct to_hash of MC with visual prompts

[#39902221] ready to go!