intx 0.5.0

Added

• Support for using intx dependency as a CMake subproject (e.g. by git submodules or FetchContent). #160
• Support for building intx exceptions handling disabled (-fno-exceptions) and without RTTI (-fno-rtti). #164

Changed

• Converted to header-only library. #155 #156
• Addition / subtraction optimizations. #115 #117 #130
• Division optimizations. #129 #131 #134 #141 #147 #171
• Exponentiation optimizations. #128 #146

Removed

• The unused builtins.h header has been deleted. #173