v2.2.1

• Add L2 when light volumes are disabled
• Added specular occlusion exponent parameter
• Increased width of graph properties element
• Disabled inverse square attenuation by default for built-in
  • Its not compatible with rest of the content
  • Enabled in the config by defining SQUARE_FALLOFF_ATTENUATION
• Cleared up how PBR features are enabled in the graph
  • Coat and Thin Film do not require special keywords anymore to be enabled
  • Use a keyword in the graph instead and set weight to constant 0 to fully disabled in compiled code
  • Anisotropy however still requires a special keyword _ANISOTROPY because it can't be optimized at compile time even when set to 0
• Fixed specular occlusion not enabled in URP
• Added a new Simple and Full PBR graph creation options in the context menu because the main shader is becoming too complex