Implement Interactive Mode

[f-michaut]

Implement interactive mode.

The user should have a banner with the available actions, which he can either type the name (like a bash command) or a shortcut (underlined or in parenthesis), or the number of the action.

Then, execute the selected action, display any output information to the user and prompt again.

Long actions (eg: download/upload) should happen async. The user can see the current status on each prompt refresh.

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Actions :

• list-files

• send-file

• receive-file

• settings (edit Config)

• enable/disable server

• connect (to a different client)

• exit

• help

Certain actions (like settings) could open a sub-prompt, with different actions to choose from. Using help would only show theses new actions, and choosing exit would only exit the sub-prompt.