Bug fixes

• #5792 AiMakeTx should output error messages
• #5827 Automatic reloading of a procedural with lights doesn't work
• #5881 Allow changing thread_priority in Windows
• #5925 Properly handle cases where cpuset is smaller than the detected number of cores
• #5926 ignore_motion_blur with non-zero reference_time does not work with a polymesh with normals
• #5953 Wrong stats after destroying shape nodes
• #5858 IPR moving in kick doesn't work in flat scenes