Cycles_path_guiding tests

@moony @Metin_Seven @Ace_Dragon @LemonBranny
After some delay, I finally got time to work on support for glossy materials.
The build bot is cooking a version right now.

there is now an additional parameter, “Directional Sampling Type”:

  • Diffuse Product (old version for diffuse only)
  • Re-sampled Importance Sampling (Version 1 for glossy support)
  • Roughness-based (Version 2 for glossy support)

Atm, these new versions are not optimized for speed, so please test equal sample counts for now and give feedback about all three types.
Note: guiding is currently only available for fully-opaque surfaces.

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