Refactor ComponentParameter and GenericCollectionComponentAdapter

SITUATION:
========

The current support for GenericCollections is hacked into the ComponentParameter's dependencies resolution. Additionally we cannot support empty collections. Use case:

class Observer{
Observer(Listener[] listeners)
}

Now imagine the listeners are provided by configuration and none is configured ==> suddenly we have an unresolved dependency.

PROPOSAL:
========

Refactor out the resolution of non-collecting arguments into a SingleComponentParameter and derive ComponentParameter from this one supporting collections. Add an optional boolean ctor parameter to ComponentParameter to allow empty collections as valid result.

BENEFITS:
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• Cleaned-up implementation of two separate resolution strategies.

• User has the choice to drop the collection at all.

• Entirely backward compatible