complete ParticleCoreShellItem's serialization

GUI/Model/Sample/ParticleCoreShellItem.cpp

@@ -38,6 +38,15 @@ ParticleCoreShellItem::ParticleCoreShellItem()
 {
 }
 
+void ParticleCoreShellItem::serialize(Serializer& s)
+{
+    s.assertVersion(0);
+    s.rw(m_abundance);
+    s.rw(m_position);
+    s.rw("core", m_core);
+    s.rw("shell", m_shell);
+}
+
 std::unique_ptr<ParticleCoreShell> ParticleCoreShellItem::createParticleCoreShell() const
 {
     std::unique_ptr<Particle> P_core{};

GUI/Model/Sample/ParticleCoreShellItem.h

@@ -26,6 +26,7 @@ class MaterialModel;
 class ParticleCoreShellItem : public ItemWithParticles {
 public:
     ParticleCoreShellItem();
+    void serialize(Serializer& s) override;
 
     std::unique_ptr<ParticleCoreShell> createParticleCoreShell() const;