Refactor TestSelection class to implement IEnumerable interface #1136
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This PR resolves issue #1111
The root cause of that crash was that the code didn't handle checking/unchecking TestGroups nodes so far.
This solution improves the TestSelection class so that either TestNodes or TestGroups maybe added. For that purpose the internal implementation was changed: the TestSelection class exposes only the interface IEnumerable<TestNode> and uses a private Hashset for the list of nodes internally. So the choice about using a Hashset or List is only an internal implementation detail of that class.
As a consequence several code locations must be adapted. These adaptations were not conceptual changes, but mostly using Linq to access the IEnumerable<TestNode>.