audio.cpp 0.5 adds DramaBox expressive TTS, Confucius4 voice transfer

Release 0.5 adds nine new models, led by DramaBox, a prompt-directed voice-acting TTS built on the LTX-2.3 audio architecture that controls emotion, delivery, laughs, sighs, and pauses. Also new: Confucius4 cross-lingual voice transfer and ROCm/HIP support.
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