Make more dynamic PageTop->alter()

Please review.

Hi,

I am ok with the change and the feature request.

Code quality tools needs to be fixed before merging.

Please give more details of what is your usage.

PageTop->alter() is just an OOP wrapper around hook before Core had the ability to declare hooks in classes with PHP attribute. So its signature should match the hook one. It is not intended to be reused anywhere in the code.

What can be done is part of PageTop->alter() could be extracted in a service or put directly into the UiSkinsUtility class.