Adding target point definition and calculation (x,y,radius) for visualization

Apologies in advance for:
1) Changing flatbuffer definitions
1a) Moved to camera poses, since I think it really belongs there
1b) Changed name of target, since it had same name as those in trainging data
2) A lot of formatting from running yapf, buildifier, clang-format.
(BUILD, target_definition_test.py have formatting changes only)
(define_training_data.py and load_sift_training.py are mostly formatting)

Change-Id: Iace1261ea5f04aeb8103b5b9a9d6da5ec3328293
diff --git a/y2020/vision/BUILD b/y2020/vision/BUILD
index b643fcb..5e65387 100644
--- a/y2020/vision/BUILD
+++ b/y2020/vision/BUILD
@@ -31,14 +31,14 @@
     srcs = [
         "camera_reader.cc",
     ],
+    data = [
+        "//y2020:config.json",
+    ],
     restricted_to = [
         "//tools:k8",
         "//tools:armhf-debian",
     ],
     visibility = ["//y2020:__subpackages__"],
-    data = [
-        "//y2020:config.json",
-    ],
     deps = [
         ":v4l2_reader",
         ":vision_fbs",