Handle self-referencing generic classes

[ds5678]

Resolves #469

This was caused by a generic class referencing itself.

public abstract class RegionDialogContext<TStage> : DialogContext<RegionDialogContext<TStage>.State> where TStage : StageContext, new()
{
	public class State
	{
	}
}

[coveralls]

Pull Request Test Coverage Report for Build 15622257744

Details

• 8 of 9 (88.89%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 34.338%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Cpp2IL.Core/Model/Contexts/GenericInstanceTypeAnalysisContext.cs	6	7	85.71%

Totals
Change from base Build 15377281678:	0.03%
Covered Lines:	4189
Relevant Lines:	10823

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💛 - Coveralls