Creating a sub command task list

[JakeRoggenbuck]

• Create a new function in another file, usually system.rs, power.rs, or thermal.rs
• Possibly add unit tests for this new function, especially if parsing
• Add a function to print it with print_{thing}() as the function name...

fn print_{thing}(raw: bool) {
    // ...
}

• Add it as a method to either the Getter or Setter trait in interface.rs (Should be very short)

fn speeds(&self, raw: bool) {
    let speeds = list_cpu_speeds();
    print_cpu_speeds(speeds, raw);
}

• Add it as an option in structopt in main.rs

/// The speed of the individual cores
#[structopt(name = "speeds")]
Speeds {
    #[structopt(short, long)]
    raw: bool,
},

• Add a call to the interface from the parse of the structopt like so...

GetType::Speeds { raw } => {
    int.get.speeds(raw);
}

• Add a match for it in the interactive mode

"get speeds" => int.get.speeds(false),

• Add it as a help option in the help function in interactive.rs

pub fn help() {
    const HELP_TEXT: &str = "\
    - get
      - freq
      - cpus
      etc.
    ";
}