Cleaned up RobotBase, removed singleton list from SensorBase, and removed unused typedefs and NULL_TASK macro from HAL's Task.hpp. Making the robot class instance static fixed non-POD statics used by the instance during destruction from being destroyed first.
In case of Spontaneous wake ups, we should be checking a condition
variable as well.
Note that we can not use the existing m_newControlData, as that has a
possible race condition with existing user code that it does not look
like we could work around.
The network communication headers were moved to the include directory of the HAL and their copies were removed from wpilibc. Also, symModuleLink.h was removed because the function which it prototypes hasn't been used in WPILib since the roboRIO switch.
Rename the following folders:
hal/lib/Athena -> hal/lib/athena
hal/lib/Desktop -> hal/lib/sim
hal/lib/Shared -> hal/lib/shared
wpilibc/Athena -> wpilibc/athena
wpilibc/simulation -> wpilibc/sim
Windows users may need to run gradlew clean after updating.
