Merge branch '18254-use-better_errors-editor-links-in-sherlock' into 'master'

Use better_errors editor links in sherlock

Closes #18254. Uses the same editor configuration of `better_errors`
so that you don't have to configure things twice. Remember to have a
custom initializer that specifies your editor.

Example for atom. File `config/initializers/better_errors.rb`:
````ruby
if defined?(BetterErrors)
  BetterErrors.editor = "atm://open?url=file://%{file}&line=%{line}"
end
````

See merge request !4497

app/views/sherlock/queries/_backtrace.html.haml

@@ -6,6 +6,10 @@
     %ul.well-list
       - @query.application_backtrace.each do |location|
         %li
+          %strong
+            - if defined?(BetterErrors)
+              = link_to(location.path, BetterErrors.editor[location.path, location.line])
+            - else
               = location.path
           %small.light
             = t('sherlock.line')

app/views/sherlock/queries/_general.html.haml

@@ -11,13 +11,17 @@
           = @query.duration.round(4)
           = t('sherlock.milliseconds')
       %li
+        - frame = @query.last_application_frame
         %span.light
           #{t('sherlock.origin')}:
         %strong
-          = @query.last_application_frame.path
+          - if defined?(BetterErrors)
+            = link_to(frame.path, BetterErrors.editor[frame.path, frame.line])
+          - else
+            = frame.path
         %small.light
           = t('sherlock.line')
-          = @query.last_application_frame.line
+          = frame.line
 
   .panel.panel-default
     .panel-heading