feature: process commands with table

[Niuslar]

@Vavat I saw this in a book and thought it could be used here. It is a way to process commands using an array of commands and function pointers. What I did was:

• Create a command_t struct that includes name, argument count and function to execute
• Create an array of commands
• Create function wrappers so all of them have the same signature
• In newCommand I moved the "Argument out of bounds" check inside each method it calls.
• I created two new member functions for setambient and setincubator, before they were part of the newCommand method

I think this is much easier to read and it makes it easier to add new commands if we need to. Let me know what you think

[Niuslar]

This could lead to bugs and it is not clear for someone who's not familiar with the code.