[Code Style] Clean up plugins

Codestyle fixes for plugins

Cleanup PR
Some more cleanup
[Code Style] administrator/components/com_checkin. Closes #4524
[Code Style] com_users backend. Closes #4522
[Code Style]  libraries/joomla/utilities folder. Closes #4523
[Code Style] Clean up libraries/joomla/archive. Closes #4525
[Code Style]Clean up libraries/joomla/cache
[Code Style] administrator/components/com_config
[Code Style] Fix my typo.
[Code Style]Clean up libraries/joomla/client
Merge pull request #4526 from roland-d/libraries_joomla_cache_cs

[Code Style] Clean up libraries/joomla/cache
Merge pull request #4529 from chrisdavenport/cs6

[Code Style] administrator/components/com_config
Merge pull request #4531 from roland-d/libraries_joomla_client_cs

[Code Style] Clean up libraries/joomla/client
Restore the file
Merge pull request #4516 from roland-d/plugins_cs

[Code Style] Plugins
[Code Style]Clean up libraries/joomla/document
[Code Style]Clean up libraries/joomla/facebook
Merge pull request #4537 from roland-d/libraries_joomla_facebook_cs

[Code Style] Clean up libraries/joomla/facebook
Merge pull request #4536 from roland-d/libraries_joomla_document_cs

[Code Style] Clean up libraries/joomla/document
[Code Style]Clean up libraries/joomla/filesystem