Implement `CppTypePrinter.VisitPrimitiveType(PrimitiveType, TypeQualifiers)`.

src/AST/CppTypePrinter.cs

@@ -177,6 +177,12 @@ namespace CppSharp.AST
             throw new NotSupportedException();
         }
 
+        public virtual string VisitPrimitiveType(PrimitiveType primitive, TypeQualifiers quals)
+        {
+            var qual = GetStringQuals(quals);
+            return $"{qual}{VisitPrimitiveType(primitive)}";
+        }
+
         public virtual string VisitTypedefType(TypedefType typedef, TypeQualifiers quals)
         {
             FunctionType func;
@@ -297,11 +303,6 @@ namespace CppSharp.AST
             return string.Empty;
         }
 
-        public virtual string VisitPrimitiveType(PrimitiveType type, TypeQualifiers quals)
-        {
-            throw new NotImplementedException();
-        }
-
         public virtual string VisitDeclaration(Declaration decl, TypeQualifiers quals)
         {
             throw new NotImplementedException();