Weather and Day - Night Cycle System

Add immersive environmental effects with a flexible Weather Manager and a comprehensive Day Night Manager. The Weather Manager includes particle systems for rain, snow, fog, and thunder, along with controls for weather update intervals, occurrence probabilities, thunder lighting, and sound variation. The Day Night Manager handles sun rotation, directional lighting, ambient and window colors, timed sunrise/sunset transitions, skybox swaps, automatic lighting and window states, optional night fog, and optional UnityEvents for sunrise and sunset callbacks.