Remove BOM from log and config files

BepInEx.Core/Configuration/ConfigFile.cs

@@ -281,7 +281,7 @@ namespace BepInEx.Configuration
                 var directoryName = Path.GetDirectoryName(ConfigFilePath);
                 if (directoryName != null) Directory.CreateDirectory(directoryName);
 
-                using (var writer = new StreamWriter(ConfigFilePath, false, Encoding.UTF8))
+                using (var writer = new StreamWriter(ConfigFilePath, false, Utility.UTF8NoBom))
                 {
                     if (_ownerMetadata != null)
                     {

BepInEx.Core/Logging/DiskLogListener.cs

@@ -53,7 +53,7 @@ namespace BepInEx.Logging
                 localPath = $"LogOutput.{counter++}.log";
             }
 
-            LogWriter = TextWriter.Synchronized(new StreamWriter(fileStream, Encoding.UTF8));
+            LogWriter = TextWriter.Synchronized(new StreamWriter(fileStream, Utility.UTF8NoBom));
 
             if (delayedFlushing) FlushTimer = new Timer(o => { LogWriter?.Flush(); }, null, 2000, 2000);
 

BepInEx.Core/Utility.cs

@@ -22,6 +22,11 @@ namespace BepInEx
         ///     <see cref="System.Reflection.Emit" /> namespace.
         /// </summary>
         public static bool CLRSupportsDynamicAssemblies => CheckSRE();
+        
+        /// <summary>
+        ///	An encoding for UTF-8 which does not emit a byte order mark (BOM). 
+        /// </summary>
+        public static Encoding UTF8NoBom { get; } = new UTF8Encoding(false);
 
         private static bool CheckSRE()
         {