Modularize lib structure.

[Istar-Eldritch]

I would like to modularize the library splitting it in different modules instead of having it in one giant file. The idea is no keep context while developing, allowing for easier implementation of new features without refactoring old logic and reduce the amount of duplicated code.
This should also make easier for new contributors to adventure on adding new logic.

I would like to start by:

• Split the modules by command.
• Extract common logic to utils modules.

What do you think?