add random shuffle util

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/rand.rs

@@ -4,7 +4,12 @@ use std::{
 };
 
 use arrayvec::ArrayString;
-use rand::{thread_rng, Rng};
+use rand::{seq::SliceRandom, thread_rng, Rng};
+
+pub fn shuffle<T>(vec: &mut [T]) {
+	let mut rng = thread_rng();
+	vec.shuffle(&mut rng);
+}
 
 pub fn string(length: usize) -> String {
 	thread_rng()