First version of asynchronix based mini simulator

- Basic simulator with 3 devices
- Can be driven via a UDP interface
- Design allows to drive the simulation via different interface in the future
  by using Request/Reply messaging.

satrs-minisim/src/time.rs

@@ -0,0 +1,5 @@
+use asynchronix::time::MonotonicTime;
+
+pub fn current_millis(time: MonotonicTime) -> u64 {
+    (time.as_secs() as u64 * 1000) + (time.subsec_nanos() as u64 / 1_000_000)
+}