accrete 0.2.0

Rust port of Accrete, planetary system generation algorithm. Based on 'Formation of Planetary Systems by Aggregation: A Computer Simulation' by Stephen H. Dole. Improved and extended by many talented people during past ~50 years.
Documentation 
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use crate::{structs::Planetesimal, utils::random_id};

use rand::RngCore;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Ring {
    pub a: f64,
    pub mass: f64,
    pub width: f64,
    pub id: String,
}

impl Ring {
    pub fn from_planet(roche_limit: f64, moon: &Planetesimal) -> Self {
        Ring {
            a: roche_limit,
            mass: moon.mass,
            width: moon.radius * 2.0,
            id: moon.id.clone(),
        }
    }

    pub fn new(a: f64, mass: f64, width: f64, rng: &mut dyn RngCore) -> Self {
        Ring {
            a,
            mass,
            width,
            id: random_id(rng),
        }
    }
}