Create the ability to send reports to moderators

- Limited to Builders+
-- Moderator+ can also use as they may be too busy ATM
- Only on users, comments, and forum posts
- Multiple reports can be generated per instance
- Primarily posts to a moderator-only topic for viewability
- Secondarily has a table for searchability
-- Viewable only by moderators

db/migrate/20200117220602_create_moderation_reports.rb

@@ -0,0 +1,12 @@
+class CreateModerationReports < ActiveRecord::Migration[6.0]
+  def change
+    create_table :moderation_reports do |t|
+      t.timestamps
+      t.references :model, polymorphic: true, null: false
+      t.integer :creator_id, null: false
+      t.text :reason, null: false
+    end
+
+    add_index :moderation_reports, :creator_id
+  end
+end