TUI for crate management like lazydocker and lazynpm. Shouldve named it as lazycargo but lazycrates sounded good at that time.

WIP, not even alpha.

TODO:

• important: add checks (eg. Cargo.toml exists?, or any fields in it)
• better parsing toml file.
• better module structure.
• implement basic stuff like in lazynpm.
• add an actions module.
• a popup api (maybe for help pages for the current panel)
• introduce a theming concept maybe.
• add user config options.