build tool config in Python

[tristan0x]

Move tool (clang-format, clang-tidy, ...) config generation from CMakeLists to Python

Improve bbp-{tool}.py scripts:

• new Tool class to wrap configuration generation
• simplify CLI mostly by providing default values for all options

It allows using these wrapper scripts directly without having to call CMake before to build the tool config.

[1uc]

The regex in cpp/CMakeLists.txt (old line 130) might be missing C++ files names *.C.

[tristan0x]

The regex in cpp/CMakeLists.txt (old line 130) might be missing C++ files names *.C.

Thank you @1uc I need to rework this part in a separate patch. I will add this extension when doing it.