Make controller shutdown easier for components JS based mappings.

[Swiftb0y]

TODO:

• Document on Wiki

[Swiftb0y]

I just added this sentence to the ComponentContainer documentation:

• shutdown: Iterate over all Components and call their shutdown methods. The Button is the only component with a predefined shutdown method. All other components have to be implemented manually.

is this sufficient as documentation?

[Be-ing]

LGTM thanks for this nice little addition.