Move VisionStatus to an event loop

Convert the simulation over to using SimulatedEventLoop as well.

Change-Id: I05d837530f83df5432f056ca5ef6515fbab5f897
diff --git a/y2017/vision/vision.q b/y2017/vision/vision.q
index b3eeee8..6e4a02a 100644
--- a/y2017/vision/vision.q
+++ b/y2017/vision/vision.q
@@ -1,5 +1,6 @@
 package y2017.vision;
 
+// Published on ".y2017.vision.vision_status"
 message VisionStatus {
   bool image_valid;
 
@@ -11,4 +12,3 @@
   // Capture time of the angle using the clock behind monotonic_clock::now().
   int64_t target_time;
 };
-queue VisionStatus vision_status;