1.7.0

• Spectra measured in 2023 can be found again
• Any spectra measured in previous years that haven't been archived will be found correctly in future
• User config now contained in a config.toml
• Various files for program configuration (groups.json, mora_path.txt, update_path.txt) now collected together in config.toml
• Internal restructuring to make future maintenance easier
• Removal of deprecated (<v1.5.2) things