v0.7

• Fixes for shader/rendering artifacts
  • Clamp NdotL and NdotV to 0.0
  • Fix GGX/Trowbridge-Reitz equation for normal distribution function
  • Fix normalization of normal vector in the fragment shader
• Optimizations
  • Use a dedicated shadow shader to avoid expensive PBR functions (mostly helps Intel)
  • Remove Fresnel term from diffuse (i.e., use simple Lambertian)
  • Use Spherical Gaussian approximation in the Fresnel equation
• Automatically enable auto shader on TextNodes found in the scene graph (fixes TextNode rendering)