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.

**sandbox:** http://studio.polesye.m.sandbox.edx.org/
@polesye 
> Looks like they are independent modules. I do not see any reasons to add notes in this list. Enabling My Notes page shouldn't affect our Student Notes.

OK, thanks for looking into it.