Project creation command-line tool

[geoffreygarrett]

There's a tool I worked on for generating desired project types C++/Python/Pybind from jinja2 templates (tudatpy/cli) which is a prototype. Creating this issue as it needs to be documented and polished.

Other functions that will stem from this tool, will be the autogeneration of tudat features (e.g. acceleration models) in external standalone projects, so that additional features can be compiled and tested in a standalone fashion.

This also allows an individual to propose a feature in Python, in a consistent format (derived from a template) that a tudat-team developer can add to the next release in the C++ kernel.