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/aos/ipc_lib/signal_stress.cc b/aos/ipc_lib/signal_stress.cc
index 57a4158..0559bce 100644
--- a/aos/ipc_lib/signal_stress.cc
+++ b/aos/ipc_lib/signal_stress.cc
@@ -5,6 +5,8 @@
 #include <random>
 #include <thread>
 
+#include "gflags/gflags.h"
+
 #include "aos/events/epoll.h"
 #include "aos/init.h"
 #include "aos/ipc_lib/latency_lib.h"
@@ -12,7 +14,6 @@
 #include "aos/logging/logging.h"
 #include "aos/realtime.h"
 #include "aos/time/time.h"
-#include "gflags/gflags.h"
 
 // This is a demo program which uses Real-Time posix signals to communicate.
 // It measures both latency of a random timer thread, and latency of the