update entt to v3.15.0

framework/imgui/src/mm/services/scene_tools.cpp

@@ -111,7 +111,7 @@ namespace MM::Services {
 			if (ImGui::Begin("Scene Metrics##ImGuiSceneToolsService", &_show_scene_metrics)) {
 				ImGui::Text("capacity: %zu", scene.storage<::MM::Entity>().capacity());
 				ImGui::Text("size: %zu", scene.storage<::MM::Entity>().size());
-				ImGui::Text("alive: %zu", scene.storage<::MM::Entity>().in_use());
+				ImGui::Text("alive: %zu", scene.storage<::MM::Entity>().free_list());
 				if (ImGui::CollapsingHeader("orphans")) {
 					// iterating all entities is expensive
 					size_t orphans = 0;

framework/organizer_scene/src/mm/services/organizer_scene.cpp

@@ -23,7 +23,7 @@ static std::ostream& operator<<(std::ostream& out, const std::vector<entt::organ
 	}
 
 	for (size_t i = 0; i < nodes.size(); i++) {
-		for (const size_t child : nodes[i].children()) {
+		for (const size_t child : nodes[i].in_edges()) {
 			out << "n" << child << " -> " << "n" << i << ";\n";
 		}
 	}

systems/player_velocity/src/mm/systems/player_velocity2d_system.hpp

@@ -4,6 +4,8 @@
 #include <mm/services/input_service.hpp>
 #include <mm/components/velocity2d_position_intent.hpp>
 
+#include <entt/entity/storage.hpp>
+
 namespace MM::Systems {
 
 	// this system transforms the input from the input_service into velocity intent

systems/simple_velocity/src/mm/systems/simple_velocity_system2d.hpp

@@ -7,6 +7,7 @@
 #include <mm/components/time_delta.hpp>
 
 #include <entt/fwd.hpp>
+#include <entt/entity/storage.hpp>
 
 namespace MM::Systems {