use MI ontology to classify interactor types

[colin-combe]

from @bmeldal

I agree with the argument about the separation and making integration of the viewer by a third party easy. The problem is that we never know that an interactor type is missing until we accidentally find a case that's broken. So a way that doesn't rely on hard-coding type and symbol but using the MI ontology to find the right branch for the type would be ideal - not? In most cases the missing symbols were "new" types of RNAs (new = not use as an interactor yet, not new to biology) so being able to identify them as "RNA" and then grabbing the right symbol would be best.

[colin-combe]

in meeting we just decided not to change this