Improve Legacy Component serialization size

Don't constantly send format: false for all formatting options when parent already
has it false

Going to PR this to Spigot, but putting it out here for now

Should help with reducing size of items with lots of colors from
legacy format.

Spigot-Server-Patches/0524-Improve-Legacy-Component-serialization-size.patch

@@ -0,0 +1,47 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sun, 28 Jun 2020 19:08:41 -0400
+Subject: [PATCH] Improve Legacy Component serialization size
+
+Don't constantly send format: false for all formatting options when parent already
+has it false
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java b/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
+index a423e3bf3906d3114af885c48d0b45d88d7e7d8b..a223d70b8ae6e6c238877d262b663c8f38d7680c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
+@@ -45,6 +45,7 @@ public final class CraftChatMessage {
+         // Separate pattern with no group 3, new lines are part of previous string
+         private static final Pattern INCREMENTAL_PATTERN_KEEP_NEWLINES = Pattern.compile("(" + String.valueOf(org.bukkit.ChatColor.COLOR_CHAR) + "[0-9a-fk-orx])|((?:(?:https?):\\/\\/)?(?:[-\\w_\\.]{2,}\\.[a-z]{2,4}.*?(?=[\\.\\?!,;:]?(?:[" + String.valueOf(org.bukkit.ChatColor.COLOR_CHAR) + " ]|$))))", Pattern.CASE_INSENSITIVE);
+         // ChatColor.b does not explicitly reset, its more of empty
++        private static final ChatModifier EMPTY = ChatModifier.b; // Paper - OBFHELPER
+         private static final ChatModifier RESET = ChatModifier.b.setBold(false).setItalic(false).setUnderline(false).setStrikethrough(false).setRandom(false);
+ 
+         private final List<IChatBaseComponent> list = new ArrayList<IChatBaseComponent>();
+@@ -111,7 +112,25 @@ public final class CraftChatMessage {
+                             throw new AssertionError("Unexpected message format");
+                         }
+                     } else { // Color resets formatting
+-                        modifier = RESET.setColor(format);
++                        // Paper start - improve legacy formatting
++                        ChatModifier previous = modifier;
++                        modifier = EMPTY.setColor(format);
++                        if (previous.isBold()) {
++                            modifier = modifier.setBold(false);
++                        }
++                        if (previous.isItalic()) {
++                            modifier = modifier.setItalic(false);
++                        }
++                        if (previous.isRandom()) {
++                            modifier = modifier.setRandom(false);
++                        }
++                        if (previous.isStrikethrough()) {
++                            modifier = modifier.setStrikethrough(false);
++                        }
++                        if (previous.isUnderlined()) {
++                            modifier = modifier.setUnderline(false);
++                        }
++                        // Paper end
+                     }
+                     needsAdd = true;
+                     break;