fix(core): Converts book packets (#413)

- [X] Splits out BaseBook
- [X] Converts book packets
- [X] Makes FixHtml faster

Projects/UOContent/Items/Books/BookContent.cs

@@ -0,0 +1,62 @@
+namespace Server.Items
+{
+    public class BookContent
+    {
+        public BookContent(string title, string author, params BookPageInfo[] pages)
+        {
+            Title = title;
+            Author = author;
+            Pages = pages;
+        }
+
+        public string Title { get; }
+
+        public string Author { get; }
+
+        public BookPageInfo[] Pages { get; }
+
+        public BookPageInfo[] Copy()
+        {
+            var copy = new BookPageInfo[Pages.Length];
+
+            for (var i = 0; i < copy.Length; ++i)
+            {
+                copy[i] = new BookPageInfo(Pages[i].Lines);
+            }
+
+            return copy;
+        }
+
+        public bool IsMatch(BookPageInfo[] cmp)
+        {
+            if (cmp.Length != Pages.Length)
+            {
+                return false;
+            }
+
+            for (var i = 0; i < cmp.Length; ++i)
+            {
+                var a = Pages[i].Lines;
+                var b = cmp[i].Lines;
+
+                if (a.Length != b.Length)
+                {
+                    return false;
+                }
+
+                if (a != b)
+                {
+                    for (var j = 0; j < a.Length; ++j)
+                    {
+                        if (a[j] != b[j])
+                        {
+                            return false;
+                        }
+                    }
+                }
+            }
+
+            return true;
+        }
+    }
+}