Use a second camera and switch between them.

Also, blink out the state over the beacon.

Change-Id: If606dfed9ae64137f71429f1190f04d5dac2c4ec
diff --git a/y2018/vision/vision.q b/y2018/vision/vision.q
new file mode 100644
index 0000000..a3b57ea
--- /dev/null
+++ b/y2018/vision/vision.q
@@ -0,0 +1,7 @@
+package y2018.vision;
+
+message VisionStatus {
+  uint32_t high_frame_count;
+  uint32_t low_frame_count;
+};
+queue VisionStatus vision_status;