Revert "Make end tag singleton"

This reverts commit 13d2ae20
Why was this changed. I doubt it did much in terms of performance. It's better to stay as close as we can to the worldedit repo.

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/v1_13_1/Spigot_v1_13_R2.java

@@ -440,7 +440,7 @@ public final class Spigot_v1_13_R2 extends CachedBukkitAdapter implements Bukkit
         } else if (foreign instanceof NBTTagString) {
             return new StringTag(foreign.asString()); // data
         } else if (foreign instanceof NBTTagEnd) {
-            return EndTag.INSTANCE;
+            return new EndTag();
         } else {
             throw new IllegalArgumentException("Don't know how to make native " + foreign.getClass().getCanonicalName());
         }

worldedit-core/src/main/java/com/boydti/fawe/FaweCache.java

@@ -174,7 +174,7 @@ public class FaweCache {
             if (clazz.getName().startsWith("com.intellectualcrafters.jnbt")) {
                 try {
                     if (clazz.getName().equals("com.intellectualcrafters.jnbt.EndTag")) {
-                        return EndTag.INSTANCE;
+                        return new EndTag();
                     }
                     Field field = clazz.getDeclaredField("value");
                     field.setAccessible(true);

worldedit-core/src/main/java/com/boydti/fawe/jnbt/NBTStreamer.java

@@ -9,24 +9,18 @@ import java.io.DataInput;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.HashMap;
-import java.util.Map;
 import java.util.function.BiConsumer;
 import java.util.function.Function;
 
 public class NBTStreamer {
     private final NBTInputStream is;
-    private final Map<String, BiConsumer> readers;
+    private final HashMap<String, BiConsumer> readers;
 
     public NBTStreamer(NBTInputStream stream) {
         this.is = stream;
         readers = new HashMap<>();
     }
 
-    public NBTStreamer(NBTInputStream stream, Map<String, BiConsumer> readers) {
-        this.is = stream;
-        this.readers = readers;
-    }
-
     /**
      * Reads the entire stream and runs the applicable readers
      *

worldedit-core/src/main/java/com/sk89q/jnbt/EndTag.java

@@ -1,40 +1,37 @@
-/*
- * WorldEdit, a Minecraft world manipulation toolkit
- * Copyright (C) sk89q <http://www.sk89q.com>
- * Copyright (C) WorldEdit team and contributors
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.sk89q.jnbt;
-
-/**
- * The {@code TAG_End} tag.
- */
-public final class EndTag extends Tag {
-    public static final EndTag INSTANCE = new EndTag();
-
-    private EndTag() {}
-
-    @Override
-    public Object getValue() {
-        return null;
-    }
-
-    @Override
-    public String toString() {
-        return "TAG_End";
-    }
-
-}
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.jnbt;
+
+/**
+ * The {@code TAG_End} tag.
+ */
+public final class EndTag extends Tag {
+
+    @Override
+    public Object getValue() {
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "TAG_End";
+    }
+
+}

worldedit-forge/src/main/java/com/sk89q/worldedit/forge/NBTConverter.java

@@ -217,7 +217,7 @@ final class NBTConverter {
     }
 
     public static EndTag fromNative(NBTTagEnd other) {
-        return EndTag.INSTANCE;
+        return new EndTag();
     }
 
     public static LongTag fromNative(NBTTagLong other) {