FEATURE: Hide Reviewable scores, change score filter to Priority

We found score hard to understand. It is still there behind the scenes
for sorting purposes, but it is no longer shown.

You can now filter by minimum priority (low, med, high) instead of
score.

spec/components/flag_query_spec.rb

@@ -8,13 +8,15 @@ describe FlagQuery do
   fab!(:codinghorror) { Fabricate(:coding_horror) }
 
   describe "flagged_topics" do
-    it "respects `min_score_default_visibility`" do
+    it "respects `reviewable_default_visibility`" do
+      Reviewable.set_priorities(medium: 10.0)
+
       admin = Fabricate(:admin)
       moderator = Fabricate(:moderator)
 
       post = create_post
 
-      SiteSetting.min_score_default_visibility = 2.0
+      SiteSetting.reviewable_default_visibility = 'low'
       PostActionCreator.spam(moderator, post)
 
       result = FlagQuery.flagged_topics
@@ -23,7 +25,7 @@ describe FlagQuery do
       expect(ft.topic).to eq(post.topic)
       expect(ft.flag_counts).to eq(PostActionType.types[:spam] => 1)
 
-      SiteSetting.min_score_default_visibility = 10.0
+      SiteSetting.reviewable_default_visibility = 'medium'
 
       result = FlagQuery.flagged_topics
       expect(result[:flagged_topics]).to be_blank
@@ -130,14 +132,16 @@ describe FlagQuery do
       expect(posts.count).to eq(1)
     end
 
-    it "respects `min_score_default_visibility`" do
+    it "respects `reviewable_default_visibility`" do
+      Reviewable.set_priorities(medium: 3.0)
+      SiteSetting.reviewable_default_visibility = 'medium'
+
       admin = Fabricate(:admin)
       flagger = Fabricate(:user)
 
       post = create_post
       PostActionCreator.create(flagger, post, :spam)
 
-      SiteSetting.min_score_default_visibility = 3.0
       posts, topics, users = FlagQuery.flagged_posts_report(admin)
       expect(posts).to be_blank
       expect(topics).to be_blank