Encorporate Save button into OutputOptions widget

[robertapplin]

Description
A "Save" or "Save Result" button is found at the bottom of many of the Indirect/Inelastic interfaces. We should look at moving this button into the "OutputOptions" widget so we reduce the amount of repeated code across the interfaces. It will also mean the widget is moved into an area of the code where we use MVP, and we can write tests for this part of functionality.

Acceptance Criteria

• The "Save" button has been moved into the "OutputOptions" widget
• It utilizes the MVP pattern and tests have been written for this moved code.