EducationalOrganizations should be CivicStructures

[vickitardif]

From the discussion at https://twitter.com/dannysullivan/status/1248363322912563205

For some reason, educational organizations (universities, elementary schools, etc) are listed under Organization but are not under CivicStructure. It is strange to not consider these physical places as well.

I propose adding CivicStructure as a supertype of EducationalOrganization in addition the the existing Organization. This is similar to the pattern for LocalBusiness.

[danbri]

This LGTM

Fast-tracking for covid-19 response /cc @tmarshbing @scor @nicolastorzec @tilid @rvguha

[danbri]

#2541 is failing checks

INFO:test_graphs:Term 'http://schema.org/2526' has nonexistent supertype: 'http://schema.org/@@@@'

Merging and fixing

[danbri]

@vholland maybe you fixed it already? the file in pending seemed ok to me, although as this isn't new vocab I'll move the fix into core.

[vickitardif]

Included in schema.org 7.04