Remove args from controllers

For the record, I started to do the same to the Users module, but turned back in horror. That is a tangled hot mess and I didn't want to break anything. :fire: 

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| Refs tickets  | https://github.com/zikula/core/issues/1788
| License       | MIT
| Doc PR        | -

This is in preparation for converting controllers to routes. refs https://github.com/zikula/core/issues/1788. I was told that "`$args` arrays are not allowed as arguments in controller methods anymore (actually they aren't for a longer time already)." (@Guite)