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/y2018/constants.h b/y2018/constants.h
index 6adcb8a..8bc5fbc 100644
--- a/y2018/constants.h
+++ b/y2018/constants.h
@@ -5,8 +5,8 @@
 #include <cstdint>
 
 #include "frc971/constants.h"
-#include "y2018/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
 #include "frc971/control_loops/double_jointed_arm/dynamics.h"
+#include "y2018/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
 #include "y2018/control_loops/superstructure/arm/arm_constants.h"
 #include "y2018/control_loops/superstructure/intake/intake_plant.h"