Server: avoid re-use of recent ParticleSpawner and Sound IDs (#14045)

This improves the reliability when removing and re-adding handles quickly.
Looping through the entire ID range avoids collisions caused by any race condition.

src/serverenvironment.h

@@ -512,6 +512,7 @@ private:
 	// Particles
 	IntervalLimiter m_particle_management_interval;
 	std::unordered_map<u32, float> m_particle_spawners;
+	u32 m_particle_spawners_id_last_used = 0;
 	std::unordered_map<u32, u16> m_particle_spawner_attachments;
 
 	// Environment metrics