Remove negated direction from GamepadDriveStrafeCommand.

The negation is not needed for the final mecanum chassis.
Add PIDConfig to the project.

PIDConfig will be used by PID systems to allow dashboard tuning of
P, I, and D values.
Add PIDTuningManager to the project.

PIDTuningManager will handle exchanging PID tuning data with the
dashboard using a NetworkTable.
Add PID tuning code to Zed.

Zed will now allow dashboard-based PID tuning while in test mode.