Switch raw file encoding from ASCII to UTF-8

Updated all text-to-byte conversions to use UTF-8 encoding instead of ASCII when saving and handling raw file content. This change improves support for non-ASCII characters and ensures better compatibility with a wider range of text data.

Author: primetime43

Call of Duty FastFile Editor/Services/RawFileService.cs

@@ -905,7 +905,7 @@ private string PromptForNewFileName(string currentName)
         /// </remarks>
         private void SaveFileNode(string ffFilePath, string zoneFilePath, RawFileNode rawFileNode, string updatedText, FastFileHeader headerInfo)
         {
-            byte[] updatedBytes = Encoding.ASCII.GetBytes(updatedText);
+            byte[] updatedBytes = Encoding.UTF8.GetBytes(updatedText);
             int updatedSize = updatedBytes.Length;
             int originalSize = rawFileNode.MaxSize;
 

Call of Duty FastFile Editor/UI/MainWindowForm.cs

@@ -859,7 +859,7 @@ private void filesTreeView_BeforeSelect(object sender, TreeViewCancelEventArgs e
                 }
                 else // DialogResult.No → discard changes
                 {
-                    // Revert the node’s content back to the last‐loaded bytes
+                    // Revert the node's content back to the last‐loaded bytes
                     var originalText = Encoding.UTF8.GetString(prevNode.RawFileBytes);
                     prevNode.RawFileContent = originalText;
                     prevNode.HasUnsavedChanges = false;
@@ -1108,7 +1108,7 @@ private ApplyChangesResult ApplyAllChangesToZone()
                 {
                     if (node.HasUnsavedChanges && !string.IsNullOrEmpty(node.RawFileContent))
                     {
-                        byte[] newContent = Encoding.ASCII.GetBytes(node.RawFileContent);
+                        byte[] newContent = Encoding.UTF8.GetBytes(node.RawFileContent);
 
                         // Handle internally compressed raw files (MW2 16-byte header format)
                         if (node.IsCompressed && node.CompressedSize > 0)