Add project files.

Bepinex-Publicizer/Bepinex-Publicizer.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Release</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{AF6224AE-B14E-4FFF-9400-77EE91F9F9D9}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Bepinex_Publicizer</RootNamespace>
+    <AssemblyName>Bepinex-Publicizer</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Bepinex-Publicizer\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>none</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AllowUnsafeBlocks>false</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="BepInEx">
+      <HintPath>..\Dependencies\BepInEx-5.4.5\core\BepInEx.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="dnlib, Version=3.3.2.0, Culture=neutral, PublicKeyToken=50e96378b6e77999, processorArchitecture=MSIL">
+      <HintPath>..\packages\dnlib.3.3.2\lib\net45\dnlib.dll</HintPath>
+    </Reference>
+    <Reference Include="UnityEngine">
+      <HintPath>..\Dependencies\UnityEngine.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="UnityEngine.CoreModule">
+      <HintPath>..\Dependencies\UnityEngine.CoreModule.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Bepinex-Publicizer/Main.cs

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+using BepInEx;
+using BepInEx.Logging;
+using dnlib.DotNet;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Security.Cryptography;
+using System.Text;
+using FieldAttributes = dnlib.DotNet.FieldAttributes;
+using MethodAttributes = dnlib.DotNet.MethodAttributes;
+using TypeAttributes = dnlib.DotNet.TypeAttributes;
+
+namespace Bepinex_Publicizer
+{
+    [BepInPlugin(GUID, MODNAME, VERSION)]
+    public class Main : BaseUnityPlugin
+    {
+        #region[Declarations]
+
+        public const string
+            MODNAME = "Bepinex_Publicizer",
+            AUTHOR = "MrPurple6411",
+            GUID = AUTHOR + "_" + MODNAME,
+            VERSION = "1.0.0.0";
+
+        internal readonly ManualLogSource log;
+
+        #endregion
+
+        public Main()
+        {
+            log = Logger;
+        }
+
+        public void Awake()
+        {
+            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
+
+            foreach(Assembly assembly in assemblies)
+				if (Path.GetDirectoryName(assembly.Location).Contains("Managed") && assembly.GetName().Name.ToLowerInvariant().StartsWith("assembly"))
+					ProcessAssembly(assembly);
+		}
+
+        void ProcessAssembly(Assembly assembly)
+        {
+			string assemblyPath = assembly.Location;
+            string filename = assembly.GetName().Name;
+			string outputPath = Path.Combine(Path.GetDirectoryName(assemblyPath), "publicized_assemblies");
+			string outputSuffix = "_publicized";
+
+			Directory.CreateDirectory(outputPath);
+
+			string lastHash = null;
+            string curHash = ComputeHash(assemblyPath);
+
+            string hashPath = Path.Combine(outputPath, $"{filename}{outputSuffix}.hash");
+
+            if (File.Exists(hashPath))
+                lastHash = File.ReadAllText(hashPath);
+
+            if (curHash == lastHash)
+				return;
+
+			log.LogMessage($"Making a public assembly from {filename}");
+            RewriteAssembly(assemblyPath).Write($"{Path.Combine(outputPath, filename)}{outputSuffix}.dll");
+            File.WriteAllText(hashPath, curHash);
+		}
+
+		static string ComputeHash(string assemblyPath)
+		{
+			StringBuilder res = new StringBuilder();
+			using (SHA1 hash = SHA1.Create())
+			{
+				using (FileStream file = File.Open(assemblyPath, FileMode.Open, FileAccess.Read))
+				{
+					hash.ComputeHash(file);
+					file.Close();
+				}
+
+				foreach (byte b in hash.Hash)
+					res.Append(b.ToString("X2"));
+			}
+
+			return res.ToString();
+		}
+
+		static ModuleDef RewriteAssembly(string assemblyPath)
+		{
+			ModuleDef assembly = ModuleDefMD.Load(assemblyPath);
+			foreach (var type in assembly.GetTypes())
+			{
+				type.Attributes &= ~TypeAttributes.VisibilityMask;
+
+				if (type.IsNested)
+					type.Attributes |= TypeAttributes.NestedPublic;
+				else
+					type.Attributes |= TypeAttributes.Public;
+
+				foreach (MethodDef method in type.Methods)
+				{
+					method.Attributes &= ~MethodAttributes.MemberAccessMask;
+					method.Attributes |= MethodAttributes.Public;
+				}
+
+				List<string> eventNames = new List<string>();
+				foreach (EventDef ev in type.Events)
+					eventNames.Add(ev.Name);
+
+				foreach (FieldDef field in type.Fields)
+				{
+					if (!eventNames.Contains(field.Name))
+					{
+						field.Attributes &= ~FieldAttributes.FieldAccessMask;
+						field.Attributes |= FieldAttributes.Public;
+					}
+				}
+			}
+			return assembly;
+		}
+	}
+}

Bepinex-Publicizer/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Bepinex_Publicizer")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Bepinex_Publicizer")]
+[assembly: AssemblyCopyright("Copyright ©  2021")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("af6224ae-b14e-4fff-9400-77ee91f9f9d9")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Bepinex-Publicizer/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="dnlib" version="3.3.2" targetFramework="net472" />
+</packages>

Bepinex-Tools.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31005.135
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Bepinex-Publicizer", "Bepinex-Publicizer\Bepinex-Publicizer.csproj", "{AF6224AE-B14E-4FFF-9400-77EE91F9F9D9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{AF6224AE-B14E-4FFF-9400-77EE91F9F9D9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AF6224AE-B14E-4FFF-9400-77EE91F9F9D9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {627A6ECF-AFCD-4092-BEE4-B620062207B8}
+	EndGlobalSection
+EndGlobal