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

@@ -23,9 +23,6 @@ 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() {

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

@@ -532,7 +532,7 @@ public final class NBTInputStream implements Closeable {
                     throw new IOException(
                             "TAG_End found without a TAG_Compound/TAG_List tag preceding it.");
                 } else {
-                    return EndTag.INSTANCE;
+                    return new EndTag();
                 }
             case NBTConstants.TYPE_BYTE:
                 return new ByteTag(is.readByte());

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) {