Require contao-community-alliance/composer-plugin ~2.0.
Require kriswallsmith/assetic ~1.1
Require bit3/contao-twig ~1.3
Require bit3/contao-meta-palettes ~1.0
Require contao-community-alliance/event-dispatcher ~1.0
Require contao-community-alliance/dependency-container ~1.0
Refactore using events.