New features

• Add Generator option include_prompt_in_result (True by default)
• Add method Whisper.encode to only run the Whisper encoder
• Add model properties Whisper.device and Whisper.device_index

Fixes and improvements

• Update the methods Whisper.detect_language, Whisper.generate, and Whisper.align to accept the encoder output
• Fix a crash when running Generator.forward on GPU and the generator object is destroyed before the forward output
• Fix parsing of Marian YAML vocabulary files containing "complex key mappings" and escaped sequences such as "\x84"