v4.0.0

[RalfG]

Fully refactored and drastically more user-friendly version of MS²PIP:

• More modular Python API
• One consolidated command-line interface with subcommands
• Support for all file formats readable by psm_utils
• Support for both MGF and mzML spectrum files
• Support for ProForma 2.0 peptide notation (no modification configuration required anymore)
• Support for multiple peptides/PSMs per spectrum
• Detailed documentation on ms2pip.readthedocs.io
• ...