* Add define SWIGWORDSIZE64 on Linux
* Add -doxygen option
* add ortools/util/python
* Move python generated stuff to BINARY_DIR/python
* Bump CMake >= 3.14 as requirement
* SWIG module rework from 3.9 to 3.14
* Python module rework in 3.12
* Drop Python 2.7 support (like in Makefile)
* Fix clean target
* OUTPUT/BYPRODUCTS path are relative to CURRENT_BINARY_DIR not WORKING_DIR
* Fix ortools package install in virtualenv
* Clean target now remove the <build>/venv directory
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