Ability to Annotate ROIs from controlled vocabulary

[JoshuaFortriede]

Often figures will be annotated to specify specific cell types or structures. It would be helpful to have a feature to specify different lists and then values in the list when assigning a comment/label to an annotation. This would allow for consistency in annotating, which could be very helpful in other workflows, such as automated scripts that convert ROI annotations to MapAnnotations.

Ideally, the lists could be JSON or CSV files, and allow for not only official labels, but synonyms that could be used to search. For instance, if labelling a erythrocyte, typing in RBC would bring up the erythrocyte term.