Rename our allwpilib (which is now 2020) to not have 2019 in the name

Change-Id: I3c07f85ed32ab8b97db765a9b43f2a6ce7da964a
diff --git a/wpiutil/src/generate/GenericNumber.java.in b/wpiutil/src/generate/GenericNumber.java.in
new file mode 100644
index 0000000..5a36582
--- /dev/null
+++ b/wpiutil/src/generate/GenericNumber.java.in
@@ -0,0 +1,34 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2019 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.wpiutil.math.numbers;
+
+import edu.wpi.first.wpiutil.math.Nat;
+import edu.wpi.first.wpiutil.math.Num;
+
+/**
+ * A class representing the number ${num}.
+*/
+public final class N${num} extends Num implements Nat<N${num}> {
+  private N${num}() {
+  }
+
+  /**
+   * The integer this class represents.
+   *
+   * @return The literal number ${num}.
+  */
+  @Override
+  public int getNum() {
+    return ${num};
+  }
+
+  /**
+   * The singleton instance of this class.
+  */
+  public static final N${num} instance = new N${num}();
+}
diff --git a/wpiutil/src/generate/Nat.java.in b/wpiutil/src/generate/Nat.java.in
new file mode 100644
index 0000000..8c471f6
--- /dev/null
+++ b/wpiutil/src/generate/Nat.java.in
@@ -0,0 +1,27 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package edu.wpi.first.wpiutil.math;
+
+//CHECKSTYLE.OFF: ImportOrder
+{{REPLACEWITHIMPORTS}}
+//CHECKSTYLE.ON
+
+/**
+ * A natural number expressed as a java class.
+ * The counterpart to {@link Num} that should be used as a concrete value.
+ *
+ * @param <T> The {@link Num} this represents.
+ */
+@SuppressWarnings({"MethodName", "unused", "PMD.TooManyMethods"})
+public interface Nat<T extends Num> {
+  /**
+   * The number this interface represents.
+   *
+   * @return The number backing this value.
+   */
+  int getNum();
diff --git a/wpiutil/src/generate/NatGetter.java.in b/wpiutil/src/generate/NatGetter.java.in
new file mode 100644
index 0000000..d268fab
--- /dev/null
+++ b/wpiutil/src/generate/NatGetter.java.in
@@ -0,0 +1,3 @@
+  static Nat<N${num}> N${num}() {
+    return N${num}.instance;
+  }