TNL-930: Turn off Student Notes when Harvard Annotation Tool is enabled.

Disables Student Notes if one of `textannotation`, `imageannotation`, `videoannotation` modules exist in the list of `Advanced Modules`.

There is still possibility to break `Student Notes` and `Harvard Annotation Tool`:
  - add one of `textannotation`, `imageannotation`, `videoannotation` to the `Advanced Modules` list;
  - add one of `textannotation`, `imageannotation`, `videoannotation` to the unit;
  - remove it form the `Advanced Modules` list => **You can enable Student Notes now. If you have both modules in the sequential, it breaks one of these modules.**

I think we should write a good note about this situation.

@tymofij , @olmar, @jmclaus, @srpearce  please review.
@polesye There is a fourth field, ```notes``` for their  ```My Notes``` page:

http://www.equtek.com/clients/edX/annotation/setup.php

I do not know if it will work independently if none of 'textannotation', 'imageannotation', 'video annotation' are present. But perhaps we should also add it to the fields?