Feature/refactor image url access

Feature/961 disagree behaviour

Feature/982 status detail view review block

Fix/jump to submission

Feature/979 reviews sidebar

Feature/978 modal actions styles

Feature/991 direct link to submission

Feature/962 Display Agree/Disagree user opinion

#962 simplify test because we already cover the get 403 for users in another test for non-staff users

GH-962 make review opinions a reusable include, get the opinion author's submission role as a method on ReviewOpinion

#962 review block: don't show _not_reviewed authors if they have left an opinion, display opinions for all types of reviews.

Feature/960 Reviewer Consensus (Agree/Disagree)