Fix tests

[haszi]

This PR fixes existing tests with the following changes:

• refactor existing setup.php to use existing autoloader and initialize basic configuration options
• add test format from php to xhtml tests
• use existing TestRender for all tests (as opposed to custom renderer in each one)
• fix minor format specific issues with dynamic properties and uninitialized arrays
• update all tests of which the underlying formatting has changed in Phd

[Girgias]

I suppose we could maybe actually run it in CI now :D

[haszi]

I suppose we could maybe actually run it in CI now :D

I actually wanted to ask you about that once this PR was merged. :-)