v2.2.0

• New features
  • Supercell Wannier localization
  • Rewritten xc parser
  • Modularize each functional
  • Greatly improve functional performance
  • Add modified functional variants
  • Modularize io module
  • Rewritten save and load functions to use JSON
  • Add a bunch of tests
  • Add a small ASCII logo in the info function
  • Update logo typography
• Updated docs
  • Add a nomenclature page of commonly used variables
  • Remove the package name from the module headings
  • Document members of classes
• Miscellaneous
  • Rename save and load to write_json and read_json
  • Fix PW spin-polarized functional
  • Align Chachiyo functional with Libxc
  • Add a germanium solid example
  • More secure coding practices
  • Removed the usage of eval, exec, and pickle
  • Add a recenter method to the Atoms and SCF class
  • Use pc-1 over pc-0 in the PyCOM extra
  • Add a pyproject.toml