Implementation of HideShowDetails feature

[Emmacho]

Ability to hide/show details such as change history, rationale, etc. to manage the complexity of the document being viewed

The feature would work as follows:
• A menu or button labeled something like “Hide/show details” would be displayed whenever any agreement text is visible, including versions presented by the ComparePrevious feature.
• If the user selects the above menu item or button, then a checkable panel of potential types of details to show or hide would appear with checkmarks by those currently shown. The detail types would include the names of parties whose proposed and/or accepted changes should be highlighted (in specific colors), private notes by the current user, notes visible to all users of this party but not others, the rationale for highlighted changes, response to the other party about highlighted changes, and so on.
• As the user selects or de-selects any checkbox, the text would instantly changes.