MCPL release 2.0.0

[tkittel]

• This milestone release brings new supported user platforms, new packaging and deployment, and a huge restructuring of the environment in which MCPL is developed and tested.
• One highly visible feature is that MCPL wheels on PyPI now provide fully-fledged installations with all features previously only available via Conda or custom builds. Thus, pip install mcpl is now an alternative to conda install -c conda-forge mcpl for getting all the features.
• Another, and perhaps the biggest, user-visible feature is that MCPL now also supports usage on Windows! This support is NOT considered experimental, and Windows users can now install the mcpl package via tools like pip and conda and expect the same features on both the command-line and in the Python and C APIs as Unix users have had in the past. Of course, there might be bugs or issues to iron out, so please help us test out the new release on Windows and file issues at https://github.com/mctools/mcpl/issues as appropriate!
• Another, less exciting but still note-worthy, change is that MCPL code is now released under the highly permissible and OSI approved Apache 2.0 license. This change in licensing was decided since the previous license (CC0) seems to have fallen out of favour in the general open source community.
• Keeping in line with general trends at github, the default branch of the mcpl repository is named main rather than master, from this point on.
• The website at https://mctools.github.io/mcpl/ has been fully updated for the new release.
• The MCPL-Geant4 hooks are moved out of the mcpl repository and into https://github.com/mctools/mcpl-geant4.
• In order to keep the mcpl package more lean, tools like ssw2mcpl, mcpl2ssw, phits2mcpl, and mcpl2phits have been moved to a separate package named mcpl-extra, which users need to install with pip or conda if they still need access to them.
• The development of MCPL 2.0.0 involved over 200 commits affecting almost 300 files, and these obviously cover many other changes big and small. Refer to the CHANGELOG for more details.

Full code differences: v1.6.2...v2.0.0

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This discussion was created from the release MCPL release 2.0.0.