Fix forward include collector to consider value class semantics in function returns.

Author: tritao

src/Generator/AST/ASTRecord.cs

@@ -163,6 +163,18 @@ public static bool IsEnumNestedInClass(this ASTRecord<Declaration> record)
             return false;
         }
 
+        public static bool IsClassReturn(this ASTRecord record)
+        {
+            var ancestors = new Stack<object>();
+            if(!record.GetAncestors<Function>(ref ancestors))
+                return false;
+
+            var function = (Function)ancestors.Pop();
+            var tagType = function.ReturnType.Type.Desugar() as TagType;
+
+            return tagType?.Declaration is Class;
+        }
+
         public static bool IsDelegate(this ASTRecord record)
         {
             var typedef = record.Object as TypedefDecl;

src/Generator/Generators/CLI/CLITypeReferences.cs

@@ -164,7 +164,7 @@ public bool IsIncludeInHeader(ASTRecord<Declaration> record)
                 return false;
 
             return record.IsBaseClass() || record.IsFieldValueType() || record.IsDelegate()
-                || record.IsEnumNestedInClass();
+                || record.IsEnumNestedInClass() || record.IsClassReturn();
         }
 
         public override bool VisitDeclaration(Declaration decl)