* This is because is not a good idea to modify the original lines
* Also I run into this issue https://gitlab.com/gitlab-org/gitlab_git/issues/14
  which is returning Diff Lines with the same @new_pos value.

Inline diff is going to be generated client side now. #3945

Now we apply syntax highlighting to the whole old and new files.
This basically help us to highlight adequately multiline content.

* It is more performant given now we process all the diff file instead
  of processing line by line.
* Multiline comments are highlighted correctly.

Handle missing settings table for metrics



See merge request !2232

Fix broken link in permissions page



See merge request !2233

This ensures we can still boot, even when the "application_settings"
table doesn't exist.