[sim] Add Java wrapper for getProgramStarted (#2566)

Also move SimHooks to wpilibj (to match wpilibc).

wpilibj/src/main/java/edu/wpi/first/wpilibj/simulation/SimHooks.java

@@ -0,0 +1,51 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package edu.wpi.first.wpilibj.simulation;
+
+import edu.wpi.first.hal.simulation.SimulatorJNI;
+
+public final class SimHooks {
+  private SimHooks() {
+  }
+
+  public static void setHALRuntimeType(int type) {
+    SimulatorJNI.setRuntimeType(type);
+  }
+
+  public static void waitForProgramStart() {
+    SimulatorJNI.waitForProgramStart();
+  }
+
+  public static void setProgramStarted() {
+    SimulatorJNI.setProgramStarted();
+  }
+
+  public static boolean getProgramStarted() {
+    return SimulatorJNI.getProgramStarted();
+  }
+
+  public static void restartTiming() {
+    SimulatorJNI.restartTiming();
+  }
+
+  public static void pauseTiming() {
+    SimulatorJNI.pauseTiming();
+  }
+
+  public static void resumeTiming() {
+    SimulatorJNI.resumeTiming();
+  }
+
+  public static boolean isTimingPaused() {
+    return SimulatorJNI.isTimingPaused();
+  }
+
+  public static void stepTiming(long delta) {
+    SimulatorJNI.stepTiming(delta);
+  }
+}