Move Il2Cpp core libraries to NuGet package

BepInEx.IL2CPP/BepInEx.IL2CPP.csproj

@@ -17,13 +17,6 @@
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
     <DebugType>none</DebugType>
   </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="UnityEngine.CoreModule-IL2CPP">
-      <HintPath>..\lib\UnityEngine.CoreModule-IL2CPP.dll</HintPath>
-      <Private>False</Private>
-      <Aliases>il2cpp</Aliases>
-    </Reference>
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\BepInEx.Core\BepInEx.Core.csproj" />
     <ProjectReference Include="..\BepInEx.Preloader.Core\BepInEx.Preloader.Core.csproj" />
@@ -36,6 +29,7 @@
     <PackageReference Include="Il2CppAssemblyUnhollower.BaseLib.Legacy" Version="0.4.10" />
     <PackageReference Include="Il2CppAssemblyUnhollower.Tool" Version="0.4.11" />
     <PackageReference Include="Il2CppDumper" Version="1.0.0" />
+    <PackageReference Include="Il2CppReferenceLibs.Core" Version="1.0.0" IncludeAssets="compile" />
     <PackageReference Include="MonoMod.RuntimeDetour" Version="20.11.26.2" />
   </ItemGroup>
   <Import Project="..\BepInEx.Shared\BepInEx.Shared.projitems" Label="Shared" />

BepInEx.IL2CPP/IL2CPPChainloader.cs

@@ -1,6 +1,4 @@
-extern alias il2cpp;
-
-using System;
+using System;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
@@ -16,7 +14,8 @@ using HarmonyLib.Public.Patching;
 using Il2Cpp.TlsAdapter;
 using UnhollowerBaseLib.Runtime;
 using UnhollowerRuntimeLib;
-using IL2CPPUnityEngine = il2cpp::UnityEngine;
+using UnityEngine;
+using Logger = BepInEx.Logging.Logger;
 
 namespace BepInEx.IL2CPP
 {
@@ -107,7 +106,7 @@ namespace BepInEx.IL2CPP
 					{
 						Logger.Sources.Add(new IL2CPPUnityLogSource());
 
-						IL2CPPUnityEngine.Application.CallLogCallback("Test call after applying unity logging hook", "", IL2CPPUnityEngine.LogType.Assert, true);
+						Application.CallLogCallback("Test call after applying unity logging hook", "", LogType.Assert, true);
 					}
 
 					unhook = true;

BepInEx.IL2CPP/Logging/IL2CPPUnityLogSource.cs

@@ -1,7 +1,6 @@
-extern alias il2cpp;
-using System;
+using System;
 using BepInEx.Logging;
-using il2cpp::UnityEngine;
+using UnityEngine;
 
 namespace BepInEx.IL2CPP.Logging
 {