Adds HAL_Initialize to ErrorBase constructor, and makes HAL_Initialize properly reentrant (#668)

Partial fix to #663, and most likely the best we are going to be able to
get.

wpilibc/src/main/native/cpp/ErrorBase.cpp

@@ -13,6 +13,8 @@
 #include <iomanip>
 #include <sstream>
 
+#include <HAL/HAL.h>
+
 #define WPI_ERRORS_DEFINE_STRINGS
 #include "WPIErrors.h"
 #include "llvm/SmallString.h"
@@ -23,6 +25,8 @@ using namespace frc;
 std::mutex ErrorBase::_globalErrorMutex;
 Error ErrorBase::_globalError;
 
+ErrorBase::ErrorBase() { HAL_Initialize(500, 0); }
+
 /**
  * @brief Retrieve the current error.
  * Get the current error information associated with this sensor.