Added a PhpStan shortcut to evaluate PR changes & moved PhpStan files

[Koen1999]

This makes it easier to review PRs and the main directory is a bit cleaner

[tomudding]

Quick question, phpstan/phpstan-baseline.neon has ignored errors. Is this intentional? Because I would think we should fix those "errors".

[Koen1999]

Quick question, phpstan/phpstan-baseline.neon has ignored errors. Is this intentional? Because I would think we should fix those "errors".

Yep, this is intentional. Laminas returns an interface that does not very accurately describe the object being returned. I actually created an issue for this hoping that it will be improved in a later version. Perhaps with a new interface that has more of the methods that we use. (laminas/laminas-mvc#77)
The errors from PhpStan which we ignore aren't actually errors. It could be nice to add checks, but this would be quite some work that doesn't add functionality.

[Koen1999]

@tomudding can we merge this so we can start using it? :)

[tomudding]

Looks to be working. But we may have to be careful with the git checkout --detach master, as not every branch is guaranteed to be based on the master branch.