WOBS-1762: Sync user profile data with Mailchimp data

Implement mailchimp list subscribe via user dashboard.

Conflicts:
	newscoop/application/Bootstrap.php
	newscoop/application/controllers/DashboardController.php
	newscoop/application/forms/Profile.php
	newscoop/tests/phpunit.xml
WOBS-1728: Meine Newsletter feature

Fixes checkboxes status
Adds redirect using meine-newsletter anchor

Conflicts:
	newscoop/application/controllers/DashboardController.php
MOTM-57: Sync User Profile with Mailchimp Data for Newsletter

Require mailchimp via composer. Finalize list subscribing.