Description:

This PR currently only contains the change to phpcs.xml. The required changes in the code are quite big, so I will split them into multiple PRs to be merged into this one. This should make reviewing a lot easier and faster.

Note: Enabling those rule one by one doesn't make too much sense, as each rule on it own would make the code readability bit worse and in the end all files would be touched multiple times.

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed