[FEATURE] Feature freeze on amboso 2.1

[jgabaut]

Eventually, parity with amboso 2.1 should be reached and a --strict flag could be implemented to disable all extension and ensure to run with full compatibility to the bash version.

Features:

• [FEATURE] Add support for a global config file #169

Not planned:

• [FEATURE] Add support for more project types #170
• [FEATURE] Rename config file to stego.toml #171
• [FEATURE] Add more keys for global config file #176
• [FEATURE] Handle multiple remotes #210