Remove outbound string length limits on signs, improve codepoint logic

now 80 chars counts multi sized code points the same so 80 chinese
characters would be allowed too.

Removed outbound limit as it doesn't solve the chunk oversize problem.

proper fix for chunk sending in another patch next.

Spigot-Server-Patches/Fix-sign-edit-memory-leak.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Fix sign edit memory leak
 when a player edits a sign, a reference to their Entity is never cleand up.
 
 diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
-index 9b857a8d1..53ef6bf17 100644
+index 04344a3711..5c58b85388 100644
 --- a/src/main/java/net/minecraft/server/PlayerConnection.java
 +++ b/src/main/java/net/minecraft/server/PlayerConnection.java
 @@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
@@ -19,13 +19,13 @@ index 9b857a8d1..53ef6bf17 100644
                  this.sendPacket(tileentity.getUpdatePacket()); // CraftBukkit
                  return;
 diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
-index 05fb2eea5..ca80391d7 100644
+index c2bcbbbab9..fdb771317a 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySign.java
 +++ b/src/main/java/net/minecraft/server/TileEntitySign.java
 @@ -0,0 +0,0 @@ public class TileEntitySign extends TileEntity implements ICommandListener {
+     // Paper start - Strip invalid unicode from signs on load
      private static final boolean keepInvalidUnicode = Boolean.getBoolean("Paper.keepInvalidUnicode"); // Allow people to keep their bad unicode if they really want it
      private boolean privateUnicodeRemoved = false;
-     public static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80);
 +    public java.util.UUID signEditor;
      // Paper end