Feature/check null behavior (#83)

* Updated scenes in Toonshader_ProjectHDRP

* Adjusted the looks of ToonShader_Firefly.unity in HDRP with the same scene in URP.

* Updated scenes in Toonshader_ProjectURP. Especially added the two layers("Main light" and "Face light") for the light culling feature.

* Updated scenes in Toonshader_ProjectLegacy. Mostly have checked each scene setting.

* Updated scene settings manly in ProjectHDRP.

Author: Nobuyuki-Kobayashi

Toonshader_ProjectHDRP/Assets/Scenes/AngelRing.unity

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