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/y2019/vision/constants_formatting_main.cc b/y2019/vision/constants_formatting_main.cc
index fd0bb22..b8f4503 100644
--- a/y2019/vision/constants_formatting_main.cc
+++ b/y2019/vision/constants_formatting_main.cc
@@ -1,6 +1,7 @@
-#include "y2019/vision/constants.h"
 #include <iostream>
 
+#include "y2019/vision/constants.h"
+
 int main(int argc, char *argv[]) {
   if (argc != 2) {
     ::std::cout << "Expected a command line argument specifying the file name "