Cars-mesh

Added

- tox testing
- continuous integration

Changed

- add used configuration file in output directory

Fixed

- clean packaging
- clean pytest warnings
- clean code
- clean documentation
- bug reader potree

Added

- Add cars-mesh first features to generate mesh from point clouds
- User guide and features documentation
- Simple installation
- First end to end test
- Code quality with pylint, flake8, isort, black
- some fixes to have a first experimental usable tool