There are still random comments, missing docstrings, very very long nested standard library syntax. Take a pass through the codebase and tidy all of these up.

As part of this PR, add linting to python (ruff, mypy) and c++ (clang-tidy)

Still TODO:

• src/cpp/charts
• CentralOpenGlWidget
• JointPlotData
• SharedXData
• python bindings cpp file
• linting (as above)