Choices Names

When changing scenes, transitions are no longer signaled by transition.
 Now, it’s just the style of transition followed by the time.

ChoiceBox can now have names set when the choice is created.

“add choice” and “end choice” have been changed to “add option” and
“end option”.  “end choices” has become “end choice”.

The size and position of choice boxes can sow be set.

Values for SceneElements can be set and checked.