feat(ClickCounter): introduced click counter config service

Dummy implementation; only sending emails to someone@example.com
chore(Symfony): updated requirements
fix(serialization): use view data instead of model data
feat(banner): activate banner

This commit introduces the use of the clickcounter service in the user interface.

It also fixes issues with handling serialization and storage of banner and domain configuration.

This commit removes windows EOL from a few files.