LOTS of changes to properly handle post/topic revisions

FIX: history revision can now properly be hidden
FIX: PostRevision serializer is now entirely dynamic to properly handle
hidden revisions
FIX: default history modal to "side by side" view on mobile
FIX: properly hiden which revision has been hidden
UX: inline category/user/wiki/post_type changes with the revision
details
FEATURE: new '/posts/:post_id/revisions/latest' endpoint to retrieve
latest revision
UX: do not show the hide/show revision button on mobile (no room for
them)
UX: remove CSS transitions on the buttons in the history modal
FIX: PostRevisor now handles all the changes that might create new
revisions
FIX: PostRevision.ensure_consistency! was wrong due to off by 1
mistake...
refactored topic's callbacks for better readability
extracted 'PostRevisionGuardian'

spec/fabricators/post_revision_fabricator.rb

@@ -1,7 +1,7 @@
 Fabricator(:post_revision) do
   post
   user
-  number 3
+  number 2
   modifications do
     { "cooked" => ["<p>BEFORE</p>", "<p>AFTER</p>"], "raw" => ["BEFORE", "AFTER"] }
   end