Add a sane limit for name length

By: Thinkofdeath <thinkofdeath@spigotmc.org>

paper-server/nms-patches/Entity.patch

@@ -574,7 +574,19 @@
              }
  
              this.dead = true;
-@@ -1721,7 +2081,26 @@
+@@ -1670,6 +2030,11 @@
+     }
+ 
+     public void setCustomName(String s) {
++        // CraftBukkit start - Add a sane limit for name length
++        if (s.length() > 256) {
++            s = s.substring(0, 256);
++        }
++        // CraftBukkit end
+         this.datawatcher.watch(2, s);
+     }
+ 
+@@ -1721,7 +2086,26 @@
      }
  
      public void a(AxisAlignedBB axisalignedbb) {