Nature Library, Nature wrapper and tests, cleanup to ensure no duplicate enums are visible outside the library.

PkmnLibSharp/Library/Items/BattleItemCategory.cs

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+namespace PkmnLibSharp.Library.Items
+{
+    public enum BattleItemCategory
+    {
+        None = 0,
+        Healing = 1,
+        StatusHealing = 2,
+        Pokeball = 3,
+        MiscBattleItem = 4,
+    }
+}

PkmnLibSharp/Library/Items/Item.cs

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+using System;
+using System.Linq;
+using PkmnLibSharp.Utilities;
+
+namespace PkmnLibSharp.Library.Items
+{
+    public class Item : PointerWrapper
+    {
+        private string _name;
+
+        public string Name => _name ??= Creatureliblibrary.Generated.Item.GetName(Ptr).PtrString();
+        public ItemCategory Category => (ItemCategory) Creatureliblibrary.Generated.Item.GetCategory(Ptr);
+
+        public BattleItemCategory BattleCategory =>
+            (BattleItemCategory) Creatureliblibrary.Generated.Item.GetBattleCategory(Ptr);
+
+        public int Price => Creatureliblibrary.Generated.Item.GetPrice(Ptr);
+        public byte FlingPower => Pkmnlib.Generated.Item.GetFlingPower(Ptr);
+
+        public bool HasFlag(string s)
+        {
+            return Creatureliblibrary.Generated.Item.HasFlag(Ptr, s.ToPtr()) == MarshalHelper.True;
+        }
+
+        internal Item(IntPtr ptr) : base(ptr)
+        {
+        }
+
+        public static Item Create(string name, ItemCategory category, BattleItemCategory battleCategory,
+            int price,
+            string[] flags, byte flingPower)
+        {
+            var convertedFlags = flags.Select(x => x.ToPtr()).ToArray().ArrayPtr();
+            var p = Pkmnlib.Generated.Item.Construct(name.ToPtr(), (Pkmnlib.ItemCategory) category,
+                (Pkmnlib.BattleItemCategory) battleCategory, price, convertedFlags, (ulong) flags.Length, flingPower);
+            return new Item(p);
+        }
+
+        protected override void DeletePtr()
+        {
+            Pkmnlib.Generated.Item.Destruct(Ptr);
+        }
+    }
+}

PkmnLibSharp/Library/Items/ItemCategory.cs

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+namespace PkmnLibSharp.Library
+{
+    public enum ItemCategory
+    {
+        MiscItem = 0,
+        Pokeball = 1,
+        Medicine = 2,
+        Berry = 3,
+        TechnicalMachine = 4,
+        FormeChanger = 5,
+        KeyItem = 6,
+        Mail = 7,
+    }
+}

PkmnLibSharp/Library/Items/ItemLibrary.cs

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+using System;
+using System.Collections.Generic;
+using PkmnLibSharp.Utilities;
+
+namespace PkmnLibSharp.Library.Items
+{
+    public class ItemLibrary : PointerWrapper
+    {
+        private readonly Dictionary<string, Item> _cache = new Dictionary<string, Item>(StringComparer.InvariantCultureIgnoreCase);
+        public ulong Count => Creatureliblibrary.Generated.ItemLibrary.GetCount(Ptr);
+
+        public void Insert(string key, Item item)
+        {
+            Creatureliblibrary.Generated.ItemLibrary.Insert(Ptr, key.ToPtr(), item.Ptr).Assert();
+            _cache.Add(key, item);
+        }
+
+        public void Delete(string key)
+        {
+            Creatureliblibrary.Generated.ItemLibrary.Delete(Ptr, key.ToPtr()).Assert();
+            _cache.Remove(key);
+        }
+
+        public bool TryGet(string key, out Item item)
+        {
+            if (_cache.TryGetValue(key, out item))
+                return true;
+            var ptr = IntPtr.Zero;
+            if (Creatureliblibrary.Generated.ItemLibrary.TryGet(Ptr, key.ToPtr(), ref ptr) != MarshalHelper.True) 
+                return false;
+            if (TryResolvePointer(ptr, out item))
+            {
+                _cache.Add(key, item);
+                return true;
+            }
+            item = new Item(ptr);
+            _cache.Add(key, item);
+            return true;
+        }
+
+        public Item Get(string key)
+        {
+            if (_cache.TryGetValue(key, out var item))
+                return item;
+            var ptr = IntPtr.Zero;
+            Creatureliblibrary.Generated.ItemLibrary.Get(Ptr, key.ToPtr(), ref ptr).Assert();
+            if (TryResolvePointer(ptr, out item))
+            {
+                _cache.Add(key, item);
+                return item;
+            }
+            item = new Item(ptr);
+            _cache.Add(key, item);
+            return item;
+        }
+
+        public ItemLibrary(ulong initialCapacity) : base(
+            Creatureliblibrary.Generated.ItemLibrary.Construct(initialCapacity))
+        {
+        }
+
+        protected override void DeletePtr()
+        {
+            Creatureliblibrary.Generated.ItemLibrary.Destruct(Ptr);
+        }
+
+    }
+}