[wpiutil] Rename Java package to edu.wpi.first.util (#3431)

This is more consistent with wpimath being edu.wpi.first.math.

wpiutil/src/main/java/edu/wpi/first/util/WPIUtilJNI.java

@@ -0,0 +1,66 @@
+// 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.
+
+package edu.wpi.first.util;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public final class WPIUtilJNI {
+  static boolean libraryLoaded = false;
+  static RuntimeLoader<WPIUtilJNI> loader = null;
+
+  public static class Helper {
+    private static AtomicBoolean extractOnStaticLoad = new AtomicBoolean(true);
+
+    public static boolean getExtractOnStaticLoad() {
+      return extractOnStaticLoad.get();
+    }
+
+    public static void setExtractOnStaticLoad(boolean load) {
+      extractOnStaticLoad.set(load);
+    }
+  }
+
+  static {
+    if (Helper.getExtractOnStaticLoad()) {
+      try {
+        loader =
+            new RuntimeLoader<>(
+                "wpiutiljni", RuntimeLoader.getDefaultExtractionRoot(), WPIUtilJNI.class);
+        loader.loadLibrary();
+      } catch (IOException ex) {
+        ex.printStackTrace();
+        System.exit(1);
+      }
+      libraryLoaded = true;
+    }
+  }
+
+  /**
+   * Force load the library.
+   *
+   * @throws IOException if the library failed to load
+   */
+  public static synchronized void forceLoad() throws IOException {
+    if (libraryLoaded) {
+      return;
+    }
+    loader =
+        new RuntimeLoader<>(
+            "wpiutiljni", RuntimeLoader.getDefaultExtractionRoot(), WPIUtilJNI.class);
+    loader.loadLibrary();
+    libraryLoaded = true;
+  }
+
+  public static native void enableMockTime();
+
+  public static native void setMockTime(long time);
+
+  public static native long now();
+
+  public static native void addPortForwarder(int port, String remoteHost, int remotePort);
+
+  public static native void removePortForwarder(int port);
+}