Replace SineGenerator with WaveGenerator Brick in Theremin

[BeanRepo]

Replace SineGenerator with WaveGenerator Brick

[BeanRepo]

Overview

This PR updates the Theremin example to use the new WaveGenerator brick instead of the previous SineGenerator implementation, providing improved audio quality and smoother transitions.

Changes

Audio Generation

• Replaced custom SineGenerator implementation with the WaveGenerator brick
• Added configurable envelope parameters (attack=0.01s, release=0.03s, glide=0.02s) for smooth frequency and amplitude transitions
• Improved audio streaming with automatic background thread management and reduced latency (~30ms blocks)

Volume Handling

• Updated volume control to use integer values (0-100) instead of normalized floats (0.0-1.0)
• Simplified volume handling by using consistent 0-100 range for both amplitude and hardware volume
• Improved real-time volume response and state synchronization

Documentation

• Updated README with detailed information about the WaveGenerator brick
• Added technical specifications (sample rate, audio format, block duration)
• Improved troubleshooting section and hardware compatibility notes

Benefits

• Better audio quality: Eliminates cracks and pops with smooth envelope transitions
• Simplified code: Reduced code complexity by ~60 lines, leveraging brick functionality
• Enhanced performance: Non-blocking audio playback with automatic resource management
• Improved UX: Smoother frequency/amplitude changes and better volume control