Bunch of improvement suggestions

[Former user]

• Get a way to have asynchronous behaviours in suggestors
• Get a way to rename the native commands the way we want (AFAIK it's not possible)
• Avoid having some console parameters or commands that are private, and get a way to override them. Some examples: o verbosity is a private variable. I know there is a native command to change its value, but if I want to change it via the UI, I need to get a direct access o help is displaying a hard coded private message that I definitely would like to change: I'm forced to change your sources
• Get some callbacks from commands when they are executed