add listener to strip front controller from routes. refs #1978

I don't know if this is the best way to solve this.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| Refs tickets  | #1978
| License       | MIT
| Doc PR        | -

I considered a custom route that would redirect to a route without the FC. It didn't work as I expected so I abandoned that approach.

I am still having some issues with the News module and the setting to 'strip entry point' set to false - but only locally - it seems to work fine when I test at zikula.org. So it must be something local that is the problem.