v1.4.3

• Added HasStreams() bool to Audio to detect if a file has other video/subtitle/data/attachments streams.
• Removed Video() string from AudioWriter
• Added StreamFile() string to AudioWriter
• Removed Video from Options
• Added StreamFile to Options
• StreamFile field in Options struct adds all streams (except audio) to a file, resulting in a file with one audio stream and all other non-audio streams from the StreamFile file.