Fixed the visiting of class template specialisations.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/AST/ASTVisitor.cs

@@ -479,6 +479,7 @@ namespace CppSharp.AST
             foreach (var templateParameter in template.Parameters)
                 templateParameter.Visit(this);
 
+            if (VisitOptions.VisitClassTemplateSpecializations)
                 foreach (var specialization in template.Specializations)
                     specialization.Visit(this);
 
@@ -549,7 +550,7 @@ namespace CppSharp.AST
             if (!VisitDeclaration(context))
                 return false;
 
-            foreach (var decl in context.Classes)
+            foreach (var decl in context.Classes.Where(c => !(c is ClassTemplateSpecialization)))
                 decl.Visit(this);
 
             foreach (var decl in context.Functions)