ZoneLoading: Add ZoneMemory and the possibility to unload zones and their memory

src/ZoneCommon/Zone/Zone.cpp

@@ -7,9 +7,39 @@ Zone::Zone(std::string name, const zone_priority_t priority, IZoneAssetPools* po
     m_pools = pools;
     m_game = game;
     m_language = ZoneLanguage::LANGUAGE_NONE;
+    m_memory = new ZoneMemory();
+    m_registered = false;
+}
+
+Zone::~Zone()
+{
+    if(m_registered)
+    {
+        m_game->RemoveZone(this);
+    }
+
+    delete m_pools;
+    m_pools = nullptr;
+
+    delete m_memory;
+    m_memory = nullptr;
+}
+
+void Zone::Register()
+{
+    if (!m_registered)
+    {
+        m_game->AddZone(this);
+        m_registered = true;
+    }
 }
 
 IZoneAssetPools* Zone::GetPools() const
 {
     return m_pools;
 }
+
+ZoneMemory* Zone::GetMemory() const
+{
+    return m_memory;
+}