Only enforce CraftPlayer#remove exception on instances of EntityPlayer

Should be more friendly to plugins that dabble in inheriting NMS
entities.

Spigot-Server-Patches/0416-Block-Entity-remove-from-being-called-on-Players.patch

@@ -1,4 +1,4 @@
-From 77bf3954e56da679c67b1fab72772d8824ffb401 Mon Sep 17 00:00:00 2001
+From 0ccfc3c7b8ddd8ba3b7e3ac5e6d9d107ce7d15ff Mon Sep 17 00:00:00 2001
 From: Zach Brown <zach@zachbr.io>
 Date: Mon, 4 Feb 2019 23:33:24 -0500
 Subject: [PATCH] Block Entity#remove from being called on Players
@@ -12,17 +12,21 @@ Player we will look at limiting the scope of this change. It appears to
 be unintentional in the few cases we've seen so far.
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
-index 36a38713..7b7dc7f2 100644
+index 36a38713..fbe34290 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
-@@ -1937,6 +1937,11 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+@@ -1937,6 +1937,15 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
      public void resetCooldown() {
          getHandle().resetCooldown();
      }
 +
 +    @Override
 +    public void remove() {
++        if (this.getHandle().getClass().equals(EntityPlayer.class)) { // special case for NMS plugins inheriting
 +            throw new UnsupportedOperationException("Calling Entity#remove on players produces undefined (bad) behavior");
++        } else {
++            super.remove();
++        }
 +    }
      //Paper end