Simplify enable_output_terminal and enable_output_terminal in workflow editor.

These functions were taking in a single element and then looping through it. I hope this is not some intententional jQuery pattern to change the value of 'this' I don't quite understand and is just a remnant of when some loop over inputs was on the inside of this function or some other such refactoring.
Workflow editor backbonification - add NodeView and DataInputView.
Workflow editor backbonification - add view for output callout.
Workflow editor backbonification - add view for output data view.
Workflow editor backbonification - add view for input terminals.