feat(gameplay): add server-side entity movement and AI

Refactor LocalPlayer::update_physical to operate on a passed position, and run speed, physical, and wander AI systems in ServerEntityManager.

include/Cubed/gameplay/local_player.hpp

@@ -156,7 +156,7 @@ private:
     Gait compute_gait() const;
 
     void update_speed(float dt);
-    std::tuple<bool, bool, bool> update_physical(float dt);
+    std::tuple<bool, bool, bool> update_physical(float dt, glm::vec3& pos);
     glm::vec3 get_move_distance(float dt);
 };
 } // namespace Cubed

include/Cubed/gameplay/server_entity_manager.hpp

@@ -45,6 +45,7 @@ private:
     void handle_task();
     void send_all_entities(std::shared_ptr<Session>& session);
     void update_ai();
+    void update_move();
     template <typename... Args>
     EntityID create_entity_in_factory(Args&&... args) {
         auto entity = m_registry.create();