Add Modular Controllers

[Lukas-Sturm]

The Application should not be restricted to Dotstar LEDs.
Controllers should be able to be installed via NPM and thus as a Module. The wanted Module is then then specified as a startup parameter for the Application.

If this is easy to get running, I might consider the same thing for Animations and Notifications.

[Lukas-Sturm]

eb76c07 Needs to be tested on the raspi but looks good so far.