Ran php-cs-fixer over all code

@stof I have mixed feelings about this one.
I always wrote my code using spaces around `!` and recently I was forced to work on a codebase that didn't have spaces around it. My biggest argument support spaces was visibility. After 2 months working on code without it, I can somehow claim it depends on how polluted the file is to tell if `!` is easily visible or not.
In general, I still like and use spaces, but I don't feel that strong over it anymore. I'd be fine to switch.