main.dev.v4.0.0

What's Changed

• Use a config file for ichor
• Large updates to file reading and writing
• Generalize point directory
• New unit tests
• Update of file names and config files
• Docs and workflow updates
• update readme
• Additional support for kernels
• Added GPR models with derivatives
• Add a CLI (menu system)

A lot of other changes which have been made directly to the main branch

Full Changelog: v2.1...v4.0