test: Updated reference images after ambient super-sampling bug fix
test: updated default -av setting in rad, which affected tests
Added bias compensation to photon-mapping tests
test(mkpmap): Better choice of photon portal thanks to Roland Schregle
Switched to photon-mapping in mixtex scene to reduce artifacts
Minor calculation improvements for mixtex and added combined scene for amusement
Finished additions for BSDF's, etc. to complete primitive testing
Work in progress on test of mixtures, textures and BSDF data types
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