Update to the 2019 wpilib

Lots of gratuitious incompatibilities to deal with. Started sanifying a
few classes rather than figuring out how to update them too. Has not yet
been tested on a robot, but everything still builds so it should be
fine.

Also ported over our FPGA timestamp fixes, which were previously only in
allwpilib_2018.

Also upgraded to the new roborio compiler, which has to happen at the
same time due to incompatible pre-compiled libraries.

Change-Id: Ib9b6ad8fc0112d90a9855afe1b706588ef4ebde9
diff --git a/frc971/wpilib/ahal/Counter.h b/frc971/wpilib/ahal/Counter.h
index c32dd33..26ae7a2 100644
--- a/frc971/wpilib/ahal/Counter.h
+++ b/frc971/wpilib/ahal/Counter.h
@@ -10,8 +10,8 @@
 #include <memory>
 #include <string>
 
-#include "HAL/Counter.h"
-#include "HAL/Types.h"
+#include "hal/Counter.h"
+#include "hal/Types.h"
 #include "frc971/wpilib/ahal/AnalogTrigger.h"
 #include "frc971/wpilib/ahal/CounterBase.h"
 #include "frc971/wpilib/ahal/SensorBase.h"