Copy constructor for deep copy of World.

include/Engine/Core/World.h

@@ -15,6 +15,7 @@ public:
         : m_EventBroker(eventBroker)
     { }
     ~World();
+    World(const World& other);
 
     // Create empty entity
     EntityID CreateEntity(EntityID parent = 0);

src/Engine/Core/World.cpp

@@ -9,6 +9,15 @@ World::~World()
     }
 }
 
+World::World(const World& other)
+    : m_EventBroker(other.m_EventBroker)
+{
+    // Deep copy component pools
+    for (auto& kv : m_ComponentPools) {
+        m_ComponentPools[kv.first] = new ComponentPool(*kv.second);
+    }
+}
+
 EntityID World::CreateEntity(EntityID parent /*= 0*/)
 {
     EntityID newEntity = generateEntityID();