Improvement: new codebase structure

[Walther]

Currently, the project is a workspace with two crates:

• clovers is supposedly the "library", with core types and methods
• clovers-cli is supposedly the "binary", with the runtime and command line interface

These categorizations are not very true though.

Future ideas:

• one crate with the types, with easy export to wasm/typescript shims
• one crate with the runtime engine
• one crate with just the CLI
• optional crate with a GUI