Move HAL classes to their own base package (#1317)

Needed for modularization.

hal/src/main/java/edu/wpi/first/hal/JNIWrapper.java

@@ -0,0 +1,34 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2016-2018 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.hal;
+
+import java.io.IOException;
+
+import edu.wpi.first.wpiutil.RuntimeLoader;
+
+/**
+ * Base class for all JNI wrappers.
+ */
+public class JNIWrapper {
+  static boolean libraryLoaded = false;
+  static RuntimeLoader<JNIWrapper> loader = null;
+
+  static {
+    if (!libraryLoaded) {
+      try {
+        loader = new RuntimeLoader<>("wpiHal", RuntimeLoader.getDefaultExtractionRoot(), JNIWrapper.class);
+        loader.loadLibrary();
+      } catch (IOException ex) {
+        ex.printStackTrace();
+        System.exit(1);
+      }
+      libraryLoaded = true;
+      libraryLoaded = true;
+    }
+  }
+}