[wpilib] Remove GearTooth (#3293)

This sensor has had zero usage for many years and was last in the KOP
over a decade ago.  There are much better rotation sensors available,
and it's no longer worth maintaining this class.

wpilibc/src/main/native/cpp/GearTooth.cpp

@@ -1,43 +0,0 @@
-// Copyright (c) FIRST and other WPILib contributors.
-// Open Source Software; you can modify and/or share it under the terms of
-// the WPILib BSD license file in the root directory of this project.
-
-#include "frc/GearTooth.h"
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-constexpr double GearTooth::kGearToothThreshold;
-
-GearTooth::GearTooth(int channel, bool directionSensitive) : Counter(channel) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth", channel);
-}
-
-GearTooth::GearTooth(DigitalSource* source, bool directionSensitive)
-    : Counter(source) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth",
-                                          source->GetChannel());
-}
-
-GearTooth::GearTooth(std::shared_ptr<DigitalSource> source,
-                     bool directionSensitive)
-    : Counter(source) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth",
-                                          source->GetChannel());
-}
-
-void GearTooth::EnableDirectionSensing(bool directionSensitive) {
-  if (directionSensitive) {
-    SetPulseLengthMode(kGearToothThreshold);
-  }
-}
-
-void GearTooth::InitSendable(SendableBuilder& builder) {
-  Counter::InitSendable(builder);
-  builder.SetSmartDashboardType("Gear Tooth");
-}