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/AnalogTriggerOutput.h b/frc971/wpilib/ahal/AnalogTriggerOutput.h
index 0ddaae0..7eb3163 100644
--- a/frc971/wpilib/ahal/AnalogTriggerOutput.h
+++ b/frc971/wpilib/ahal/AnalogTriggerOutput.h
@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include "HAL/AnalogTrigger.h"
+#include "hal/AnalogTrigger.h"
 #include "frc971/wpilib/ahal/DigitalSource.h"
 
 namespace frc {