Bug fixes

• #5639 Mesh lights in procedurals not working properly
• #5982 Memory leak due to AiShaderEvalParamArray
• #5988 Avoid gcc -Wall warning about strict-aliasing in AtArray
• #5992 Color Manager: support chromaticities for additional standard gamuts / white points
• #6001 Performance regression in BVH build
• #6015 Crash with oriented curves mode when no orientations are specified