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/frc971/control_loops/BUILD b/frc971/control_loops/BUILD
index c7a5dd7..e058e11 100644
--- a/frc971/control_loops/BUILD
+++ b/frc971/control_loops/BUILD
@@ -1,8 +1,8 @@
-package(default_visibility = ["//visibility:public"])
-
 load("//aos:config.bzl", "aos_config")
 load("@com_github_google_flatbuffers//:build_defs.bzl", "flatbuffer_cc_library")
 
+package(default_visibility = ["//visibility:public"])
+
 cc_library(
     name = "control_loop_test",
     testonly = True,
diff --git a/frc971/control_loops/drivetrain/BUILD b/frc971/control_loops/drivetrain/BUILD
index d50c1f9..eaf37db 100644
--- a/frc971/control_loops/drivetrain/BUILD
+++ b/frc971/control_loops/drivetrain/BUILD
@@ -1,11 +1,11 @@
-package(default_visibility = ["//visibility:public"])
-
 load("@com_github_google_flatbuffers//:build_defs.bzl", "flatbuffer_cc_library", "flatbuffer_ts_library")
 load("//aos:config.bzl", "aos_config")
 load("//tools/build_rules:select.bzl", "cpu_select")
 load("//aos:flatbuffers.bzl", "cc_static_flatbuffer")
 load("@npm_bazel_typescript//:defs.bzl", "ts_library")
 
+package(default_visibility = ["//visibility:public"])
+
 flatbuffer_cc_library(
     name = "spline_goal_fbs",
     srcs = ["spline_goal.fbs"],