Sonus

- Replace escape character `&` in XML data with `and` (fixes 6 and 8)

- Included author and title in invalid character replacement for file paths (Fixes 5)

- Replace invalid chars in Title (Fixes 5 )

**Fixed**:
- Added more invalid character replacements for filenames

**New**
- Added option to offset (`-O, --offset`) built-in chapter markers
- Examples: `--offset +5`, `--offset 10`, `--offset -10`

**New**
- Added `-f, --ffmpeg-debug` switch for easier troubleshooting

**Fixes**
- Fixed crash when track start and end timestamps are the same (1)
- Fixed missing debug message when using `-d, --download`