* Replace usage of array_get
* Fixes
* And a few more
* Remove remaining references
* Update Service.php
* Few more fixes
* Fix.. I think?
* Fix Client / Invoice updates
* Fix stats
* Fix issues noticed during code review
* More fixes
* And some more fixes :)
* Add PHPStan extension for deprecation function usage
* Removed some deprecated functions
* And a few more
* Also remove the deprecated API calls
* Fix references to deprecated API calls
* Oh, and this too