Fill out tables for camera data some more

This should be all the information needed by all the runtime code.

Also reshuffle a few tables to be more memory-dense. This changes the
binary format, but we don't have any logfiles so whatever.

Change-Id: I85158ad8c28c349f2d1c4981fb6565b2b4804d78
diff --git a/y2020/vision/sift/sift_training.fbs b/y2020/vision/sift/sift_training.fbs
index 2af0233..5e82e9f 100644
--- a/y2020/vision/sift/sift_training.fbs
+++ b/y2020/vision/sift/sift_training.fbs
@@ -18,6 +18,9 @@
 // Represents the information used to match incoming images against.
 table TrainingData {
   images:[TrainingImage];
+
+  // Calibration information for all the cameras we know about.
+  camera_calibrations:[CameraCalibration];
 }
 
 root_type TrainingData;