Another pass on the ComponentParameters : ATLASRECTS-4983

Following some comments from @goetz trying to rationalize the ComponentParameter class.

• The clone function returns a value
• Use default for default things.
• Clients have been updated

Now the really tricky part is that the ComponentParameters do not own their TrackParameters (not now nor before).

Deletion happens in the MultiComponentParameters. This so far works but cleaning one bit , now raises further questions in another bit ;)

I think either I or @amorley should take another careful look on how these things are layered out.