Run clang-format on the entire repo

This patch clang-formats the entire repo. Third-party code is
excluded.

I needed to fix up the .clang-format file so that all the header
includes are ordered properly. I could have sworn that it used to work
without the extra modification, but I guess not.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I64bb9f2c795401393f9dfe2fefc4f04cb36b52f6
diff --git a/y2020/vision/sift/sift971.cc b/y2020/vision/sift/sift971.cc
index 788ae23..afab9b4 100644
--- a/y2020/vision/sift/sift971.cc
+++ b/y2020/vision/sift/sift971.cc
@@ -109,10 +109,11 @@
 #include <cstdarg>
 #include <iostream>
 #include <mutex>
+
+#include "glog/logging.h"
 #include <opencv2/core/hal/hal.hpp>
 #include <opencv2/imgproc.hpp>
 
-#include "glog/logging.h"
 #include "y2020/vision/sift/fast_gaussian.h"
 
 using namespace cv;