Minor missing functionality added:

• Allow Python builtins to be used as callbacks in CPython. #1413

Bug fixes:

• Fix regression in CMake Python package config: improper use of absolute path. #3144
• Fix Mingw64 and add to the CI testing matrix. #3132
• Specified UTF8-encoding in setup.py calls of open(). #3137
• Add clang-tidy-readability rules to make boolean casts explicit improving code readability. Also enabled other misc and readability clang-tidy checks. #3148
• Move object in .pop() for list. #3116

Backend and tidying up:

• Removed and fixed warning suppressions. #3127 #3129 #3135 #3141 #3142 #3150 #3152 #3160 #3161