Parser fixes

[webdevred]

1. Backup file handling

   • Replaced getWritabaleFilename with createBackupFile.
   • Safer backup file creation.

2. SupportVertex parsing for Transformation

   • Updated beam vertex parsing to handle arrays with more than two elements.

3. Parser improvements

   • Use decodeUtf8Lenient to tolerate invalid UTF-8 sequences.
   • Skip whitespace correctly before parsing object keys.
   • Allow empty objects {} and objects with inline comments.

4. Tests

   • Added test cases for empty objects, objects with whitespace, and inline comments to ensure correct parsing.