artf4149: Removed references to VxWorks

Implemented setTaskPriority() and getTaskPriority() in Task HAL API

Removed all other unimplemented functions in HAL and removed spawnTask()

Replaced instances of pthread_t* with TASK typedef

Removed unused HAL error constants and removed commented-out classes and functions in wpilibj's HALLibrary

Changed Task class API to match the construction semantics of a std::thread

Change-Id: I3bc951a3da90d24c5589fae4d1ca2bb60225c873

wpilibc/wpilibC++/src/Error.cpp

@@ -16,7 +16,6 @@
 #include "DriverStation.h"
 #include "Timer.h"
 #include "Utility.h"
-bool Error::m_suspendOnErrorEnabled = false;
 
 Error::Error() {}