Sdk/Entity: Add OnEntityDestruction callback

SDK/include/NDK/Entity.hpp

@@ -9,6 +9,7 @@
 
 #include <Nazara/Core/Bitset.hpp>
 #include <Nazara/Core/HandledObject.hpp>
+#include <Nazara/Core/Signal.hpp>
 #include <NDK/Algorithm.hpp>
 #include <memory>
 #include <vector>
@@ -65,6 +66,8 @@ namespace Ndk
 			Entity& operator=(const Entity&) = delete;
 			Entity& operator=(Entity&&) = delete;
 
+			NazaraSignal(OnEntityDestruction, Entity* /*entity*/);
+
 		private:
 			Entity(World* world, EntityId id);
 

SDK/src/NDK/Entity.cpp

@@ -145,6 +145,9 @@ namespace Ndk
 
 	void Entity::Destroy()
 	{
+		OnEntityDestruction(this);
+		OnEntityDestruction.Clear();
+
 		// We prepare components for entity destruction (some components needs this to handle some final callbacks while the entity is still valid)
 		for (std::size_t i = m_componentBits.FindFirst(); i != m_componentBits.npos; i = m_componentBits.FindNext(i))
 			m_components[i]->OnEntityDestruction();