Updated/modified PtrList implementation

• re-implement lowest-level with PtrListDetail to allow access to protected List methods
• new PtrDynList class: for a dynamically resizable PtrList with memory management.
• NO UPtrDynList since this is probably not needed and a plain DynamicList<T*> can also be used in a pinch.

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changed target branch from master to develop

changed title from Feature ptrlist to Updated/modified PtrList implementation

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• 2e85c285 - ENH: improvements for PtrList, UPtrList and new PtrDynList container

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merged