Make a DurationInSeconds function

Also, run clang-format on all the files I changed because I am too lazy
to figure out how to call clang-format on just the lines I changed.

Change-Id: I071c6f81dced533a0a269f25a258348132a7056a
diff --git a/frc971/control_loops/BUILD b/frc971/control_loops/BUILD
index 5871a29..773b6cb 100644
--- a/frc971/control_loops/BUILD
+++ b/frc971/control_loops/BUILD
@@ -303,6 +303,7 @@
     ],
     visibility = ["//visibility:public"],
     deps = [
+        "//aos/time",
         "//third_party/eigen",
     ],
 )