Revise display on note versions index

- Body now uses the diff builder to highlight changes
-- A generalized diff-body class was added instead of something specific
- The status changes are now verbalized instead of being shown with styles
- The position and sizes are now split up
-- Changes directly reference the previous version
- The date and user columns were combined
-- This is more in line with other indexes, plus it saves space

app/models/note_version.rb

@@ -18,4 +18,30 @@ class NoteVersion < ApplicationRecord
     end
     @previous.first
   end
+
+  def self.status_fields
+    {
+      body: "Body",
+      was_moved: "Moved",
+      was_resized: "Resized",
+      was_deleted: "Deleted",
+      was_undeleted: "Undeleted",
+    }
+  end
+
+  def was_moved
+    x != previous.x || y != previous.y
+  end
+
+  def was_resized
+    width != previous.width || height != previous.height
+  end
+
+  def was_deleted
+    !is_active && previous.is_active
+  end
+
+  def was_undeleted
+    is_active && !previous.is_active
+  end
 end