Coqui TTS v0.18

XTTS model release (Text-to-Speech and voice cloning)

# From the release notes:

This model is trained on top of XTTS v1, using output masking. We mask the part of the output that is used as the audio prompt while training and don't compute loss for that segment. This helps us to resolve the hallucination issue that V1 experienced.

- Add Japanese - Resolve the hallucination issue (repeating the audio prompt) - Increased expressivity - Added ne_hifigan that was trained without denoising that brought some EQ and compression profile that might be unwanted for some use-cases