fix quality flaws and refactorings
SONAR-5712 Re-merge package_design widget into file_design
SONAR-5610 Fix chrome freezes on the components page
Fix quality flaws
SONAR-5666 Remove useless {:} in ES search query
improve code coverage of DataCleaner classes
Add periodic rate when inserting issues in E/S
Add some issues perf test on queries
Automatic merge from branch-4.5

* origin/branch-4.5:
  SONAR-5610 Fix chrome freezes on the components page
SONAR-5845 Update the layout and tune the UI of the issue box
SONAR-5718 Update the font
SONAR-5718 Different fixes
Fix black header overlapping
SONAR-5845 Enable issue message escaping
SONAR-5845 Add rule permalink
SONAR-5845 Fix displaying of the project name
SONAR-5718 Disable pointer events during scroll
SONAR-5718 Fix clipping effect of the black header
SONAR-5718 Fix help closing
SONAR-5718 Add issue box tests