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/dma.h b/frc971/wpilib/dma.h
index c870728..6d82af8 100644
--- a/frc971/wpilib/dma.h
+++ b/frc971/wpilib/dma.h
@@ -9,7 +9,7 @@
 #include <array>
 #include <memory>
 
-#include "HAL/ChipObject.h"
+#include "hal/ChipObject.h"
 
 class DMA;
 namespace frc {