Rework wiki page versions index/diff views

- Changed to using the diff-body CSS class
-- Removed unnecessary elements from the CSS style file
- Does a symmetric difference on the array fields to detect differences
- Add more descriptors to the status/changes column
- Specifically add <br> to statuses to cause line breaks

app/helpers/wiki_page_versions_helper.rb

@@ -1,21 +1,4 @@
 module WikiPageVersionsHelper
-  def wiki_page_versions_listing_type
-    params.dig(:search, :wiki_page_id).present? ? :page : :global
-  end
-
-  def wiki_page_version_status_diff(wiki_page_version)
-    cur = wiki_page_version
-    prev = wiki_page_version.previous
-
-    return "New" if prev.blank?
-
-    status = []
-    status += ["Renamed"] if cur.title != prev.title
-    status += ["Deleted"] if cur.is_deleted? && !prev.is_deleted?
-    status += ["Undeleted"] if !cur.is_deleted? && prev.is_deleted?
-    status.join(" ")
-  end
-
   def wiki_other_names_diff(new_version, old_version)
     new_names = new_version.other_names
     old_names = old_version.other_names
@@ -23,9 +6,4 @@ module WikiPageVersionsHelper
 
     diff_list_html(new_names, old_names, latest_names, ul_class: ["wiki-other-names-diff-list list-inline"], li_class: ["wiki-other-name"])
   end
-
-  def wiki_body_diff(thispage, otherpage)
-    pattern = Regexp.new('(?:<.+?>)|(?:\w+)|(?:[ \t]+)|(?:\r?\n)|(?:.+?)')
-    DiffBuilder.new(thispage.body, otherpage.body, pattern).build
-  end
 end