Instead, we use XModule field default values when creating an empty
XModule. Driven by this use case, we also allow for XModules to be
created in memory without being persisted to the database at all. This
necessitates a change to the Modulestore api, replacing clone_item with
create_draft and save_xmodule.

Prevent creation of unnecessary template divs, and rename .single_templates to .single-templates for convention.

studio - changed the label of view published/live version of unit presented to a user while editing a draft of the same unit

template is empty (very awkward b/c it's a template descriptor not an
instance one)
Changed display conditionals to get the right things to show in the
right tabs for problems

styled header of problem component adding menu and made it only visible when you are in the problem menu