Adds Error Prone as compile time check to java projects (#13)

wpilibj/src/athena/java/edu/wpi/first/wpilibj/CANJaguar.java

@@ -2255,6 +2255,7 @@ public class CANJaguar implements MotorSafety, PIDOutput, CANSpeedController {
    * @deprecated Use disableControl instead.
    */
   @Override
+  @Deprecated
   public void stopMotor() {
     disableControl();
     m_stopped = true;

wpilibj/src/athena/java/edu/wpi/first/wpilibj/CANTalon.java

@@ -1255,6 +1255,7 @@ public class CANTalon implements MotorSafety, PIDOutput, PIDSource, CANSpeedCont
    * @deprecated Use disableControl instead.
    */
   @Override
+  @Deprecated
   public void stopMotor() {
     disableControl();
     m_stopped = true;

wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java

@@ -426,6 +426,7 @@ public class Encoder extends SensorBase implements CounterBase, PIDSource, LiveW
    * @return Period in seconds of the most recent pulse.
    * @deprecated Use getRate() in favor of this method.
    */
+  @Deprecated
   public double getPeriod() {
     double measuredPeriod;
     if (m_counter != null) {

wpilibj/src/athena/java/edu/wpi/first/wpilibj/PWM.java

@@ -172,6 +172,7 @@ public class PWM extends SensorBase implements LiveWindowSendable {
    * @deprecated Recommended to set bounds in ms using {@link #setBounds(double, double, double,
    * double, double)}
    */
+  @Deprecated
   public void setBounds(final int max, final int deadbandMax, final int center,
                         final int deadbandMin, final int min) {
     m_maxPwm = max;

wpilibj/src/athena/java/edu/wpi/first/wpilibj/Preferences.java

@@ -273,6 +273,7 @@ public class Preferences {
    *
    * @deprecated backwards compatibility shim
    */
+  @Deprecated
   public void save() {
   }
 }