Rewrite base controls for assessment tray

[adaburrows]

Rewrite controls used to build assessment widget since they were never spec'd out properly and don't have any of the features we need.

• [x] Separate out NHIconContainer control for assessment controls to use.
• [x] Make sure NHAssessmentContainer can handle as wide of an assessment control as needed.
• [x] Make sure NHAssessmentContainer can contain as large of an output control as needed.
• [x] Make sure NHAssessmentContainer has an edit mode.
• [x] Make sure NHAssessmentContainer has a selected mode.
• [x] Move all edit controls out of NHResourceAssessmentTray and into the config screen that uses it.