Unify pattern used for privates and constructors

In the 'managers' from ICore

Change-Id: Iab98c9e0947b759843a62e3777ba46be3b304b06
Reviewed-by: hjk <hjk121@nokiamail.com>
Remove script manager and script debugger engine.

Doesn't really serve a purpose any more.

Change-Id: I8c3bc11bf7b05a15eafd2a22456a40b270cefadf
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>