Update WPILib, roborio compilers, and CTRE Phoenix libraries

This borrows heavily from work that Ravago did to initially get this
stuff working.

Tested rudimentary functionality on a test bench, ensured that we could:
* Enable the robot.
* Read joystick and button values.
* Switch between auto and teleop modes.
* Read sensor values (encoder, absolute encoder, potentiometer).
* Read PDP values.
* Drive PWM motors.
* Drive CANivore motors.

Non-WPILib changes are made to accommodate the upgrade roborio
compiler's improved pickiness.

Merge commit '125aac16d9bf03c833ffa18de2f113a33758a4b8' into HEAD

Change-Id: I8648956fb7517b2d784bf58e0a236742af7a306a
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/aos/network/web_proxy.h b/aos/network/web_proxy.h
index 2b57c05..e38dcea 100644
--- a/aos/network/web_proxy.h
+++ b/aos/network/web_proxy.h
@@ -229,7 +229,7 @@
     bool requested = true;
   };
 
-  std::map<int, ChannelState> channels_;
+  std::map<size_t, ChannelState> channels_;
   const std::vector<std::unique_ptr<Subscriber>> &subscribers_;
 
   const std::vector<FlatbufferDetachedBuffer<MessageHeader>> config_headers_;