This avoids users having to call both IsOperatorControl() and IsEnabled() to figure out if their robot is
enabled and in the teleop state. The expression above involves calling two methods that each have their
own lock.
These new methods should only involve locking one mutex, since only one call is made to HAL_GetControlWord().
Remove WaitForCachedData as it's no longer required.
Also properly handle caching / transition detection logic that occurs at the
WPILib level.
This also changes DriverStation::IsNewControlData() to check for WPILib-level
caching instead of wrapping the HAL function.
This is useful for both cleanly exiting from simulation and for unit testing
at a framework level.
This change required removing move constructor/assignment from IterativeRobot.
The old headers were moved into folders because doing so avoids polluting
the system include directories.
Folder names were also normalized to lowercase.
