Implements growth rates

PkmnLibRSharp/FFI/StaticData/GrowthRate.cs

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+using System;
+using System.Runtime.InteropServices;
+
+using LevelInt = System.Byte;
+
+namespace PkmnLibSharp.FFI.StaticData
+{
+    internal static class GrowthRate
+    {
+        [DllImport(Data.DllName, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
+        internal static extern IntPtr growth_rate_lookup_new(IntPtr array, ulong length);
+        
+        [DllImport(Data.DllName, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
+        internal static extern void growth_rate_lookup_drop(IntPtr p);
+        
+        [DllImport(Data.DllName, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
+        internal static extern LevelInt growth_rate_calculate_level(IntPtr p, uint experience);
+
+        [DllImport(Data.DllName, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
+        internal static extern uint growth_rate_calculate_experience(IntPtr p, LevelInt level);
+    }
+}

PkmnLibRSharp/StaticData/GrowthRate.cs

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+using System;
+using System.Collections.Generic;
+using PkmnLibSharp.Utils;
+using Interface = PkmnLibSharp.FFI.StaticData.GrowthRate;
+using LevelInt = System.Byte;
+
+namespace PkmnLibSharp.StaticData
+{
+    public abstract class GrowthRate : ExternPointer<object>
+    {
+        protected internal GrowthRate()
+        {
+        }
+
+        protected internal GrowthRate(IntPtr ptr, bool isOwner) : base(ptr, isOwner)
+        {
+        }
+
+        public LevelInt CalculateLevel(uint experience)
+        {
+            return Interface.growth_rate_calculate_level(Ptr, experience);
+        }
+
+        public uint CalculateExperience(LevelInt level)
+        {
+            return Interface.growth_rate_calculate_experience(Ptr, level);
+        }
+        
+        protected override void Destructor()
+        {
+            Interface.growth_rate_lookup_drop(Ptr);
+        }
+    }
+
+    public class LookupGrowthRate : GrowthRate
+    {
+        public LookupGrowthRate(uint[] experienceArray)
+        {
+            var arrayPtr = experienceArray.ArrayPtr();
+            var ptr = Interface.growth_rate_lookup_new(arrayPtr, (ulong)experienceArray.Length);
+            InitializePointer(ptr, true);
+        }
+
+        protected override object CreateCache()
+        {
+            return new object();
+        }
+    }
+}