Adds support for Unity’s Universal Render Pipeline in Unity 2022.2 and Unity 2022.3LTS.

Unity’s new Scriptable Render Pipeline (SRP) requires a full rewrite of all shaders for each version of each SRP. This module adds support for targeting the Universal Render Pipeline (2022.2 and 2022.3LTS with URP 14.x), and works for all MicroSplat modules.