PlayableShader Globals API/MicroSplat integration

I created a new Playable Shader Global API which is available for free on my Github : https://github.com/slipster216 This allows you to create timeline animations that effect global variables, which can be used to animate any global shader parameters across the entire scene with ease. You can use these to control things like snow, wetness, raindrops, and wind in MicroSplat, or easily create new ones to use in whatever shader you like.