Include Entity view modes module

I think this is a really useful module to manage entity view modes easily.

Maybe it could be included in feature_development, but not only provides an UI. It also ensures consistency for template suggestions for all entity types, so that you can use any of the template patterns, in order of most specific to least specific:

entity-type__id__view-mode
entity-type__id
entity-type__bundle__view-mode
entity-type__bundle
entity-type