remove system property for book size limits

"It was from a different time before books were as jank as they are now. As time has gone on they've only proven to be worse and worse."

patches/server/0518-Fix-CraftTeam-null-check.patch

@@ -1,19 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: foss-mc <69294560+foss-mc@users.noreply.github.com>
-Date: Sun, 30 Aug 2020 15:30:29 +0800
-Subject: [PATCH] Fix CraftTeam null check
-
-
-diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
-index f86776aa42bd5520f8aaeaa46bb93ec4d5b4e27d..2b87a652798cb632fe76bf20e9e7f8cb8bfb3b7b 100644
---- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
-+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
-@@ -253,7 +253,7 @@ final class CraftTeam extends CraftScoreboardComponent implements Team {
- 
-     @Override
-     public boolean hasEntry(String entry) throws IllegalArgumentException, IllegalStateException {
--        Validate.notNull("Entry cannot be null");
-+        Validate.notNull(entry, "Entry cannot be null"); // Paper
- 
-         CraftScoreboard scoreboard = this.checkState();
-