Make more random

At least, make the stuff that doesn't need to be deterministic non-deterministic

src/game/rng.rs

@@ -0,0 +1,7 @@
+use rand::random;
+use wyrand::WyRand;
+
+/// Initialize a `WyRand` using `rand`'s thread-local rng
+pub fn thread_rng() -> WyRand {
+    WyRand::new(random())
+}