Added shaders for URP and changed default materials to use them

Created Shader graphs to replace the shaders not working in URP, main purpose is compatibility in AltSpaceVR -environment.

UnitySDK/.vsconfig

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+} 

UnitySDK/Assets/Scenes/SampleScene.unity

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UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/CoarseBristles/CoarseBristles_15.mat

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