[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/include/frc/GearTooth.h

@@ -1,85 +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.
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <wpi/deprecated.h>
-
-#include "frc/Counter.h"
-
-namespace frc {
-
-/**
- * Alias for counter class.
- *
- * Implements the gear tooth sensor supplied by FIRST. Currently there is no
- * reverse sensing on the gear tooth sensor, but in future versions we might
- * implement the necessary timing in the FPGA to sense direction.
- *
- * @deprecated No longer used per FMS usage reporting
- */
-class GearTooth : public Counter {
- public:
-  // 55 uSec for threshold
-  static constexpr double kGearToothThreshold = 55e-6;
-
-  /**
-   * Construct a GearTooth sensor given a channel.
-   *
-   * @param channel            The DIO channel that the sensor is connected to.
-   *                           0-9 are on-board, 10-25 are on the MXP.
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(int channel, bool directionSensitive = false);
-
-  /**
-   * Construct a GearTooth sensor given a digital input.
-   *
-   * This should be used when sharing digital inputs.
-   *
-   * @param source             A pointer to the existing DigitalSource object
-   *                           (such as a DigitalInput)
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(DigitalSource* source, bool directionSensitive = false);
-
-  /**
-   * Construct a GearTooth sensor given a digital input.
-   *
-   * This should be used when sharing digital inputs.
-   *
-   * @param source             A reference to the existing DigitalSource object
-   *                           (such as a DigitalInput)
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(std::shared_ptr<DigitalSource> source,
-                     bool directionSensitive = false);
-
-  GearTooth(GearTooth&&) = default;
-  GearTooth& operator=(GearTooth&&) = default;
-
-  /**
-   * Common code called by the constructors.
-   */
-  void EnableDirectionSensing(bool directionSensitive);
-
-  void InitSendable(SendableBuilder& builder) override;
-};
-
-}  // namespace frc