drop shifter support from the drivetrain

Everything is just commented/preprocessored out so we can easily
re-enable it next year.

Change-Id: I4387856548954cf617a525b96a8ffa573c6417a1
diff --git a/frc971/joystick_reader.cc b/frc971/joystick_reader.cc
index c96734c..6d2f1d4 100644
--- a/frc971/joystick_reader.cc
+++ b/frc971/joystick_reader.cc
@@ -174,7 +174,7 @@
     if (!drivetrain.goal.MakeWithBuilder()
              .steering(wheel)
              .throttle(throttle)
-             .highgear(is_high_gear_)
+             //.highgear(is_high_gear_)
              .quickturn(data.IsPressed(kQuickTurn))
              .control_loop_driving(is_control_loop_driving)
              .left_goal(left_goal)