Import buildifier

This patch sets up buildifier to run as part of CI. It can also be run
manually via `//tools/lint:buildifier`.

As a consequence, I needed to make the whole repo conform.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: Ic41c97b17255813b6c21aef40ab2f8a216683a2c
diff --git a/debian/opencv_python.BUILD b/debian/opencv_python.BUILD
index 5074bd3..281564b 100644
--- a/debian/opencv_python.BUILD
+++ b/debian/opencv_python.BUILD
@@ -5,9 +5,9 @@
         include = ["**/*"],
         exclude = ["**/*.py"],
     ),
+    imports = ["."],
+    visibility = ["//visibility:public"],
     deps = [
         "@python_repo//:numpy",
     ],
-    imports = ["."],
-    visibility = ["//visibility:public"],
 )