Remove large HAL headers from wpilibc headers (#1386)

Now only includes the types in the wpilib headers.
Should immensely clean up intellisense.

Closes #1383

wpilibc/src/main/native/cpp/CAN.cpp

@@ -9,7 +9,11 @@
 
 #include <utility>
 
-#include <hal/HAL.h>
+#include <hal/CAN.h>
+#include <hal/CANAPI.h>
+#include <hal/Errors.h>
+#include <hal/FRCUsageReporting.h>
+#include <hal/HALBase.h>
 
 using namespace frc;