Update ZynAddSubFX to version 3.0.5.

Full changelog:

• Add Stereo peaks for individual part metering
• Change LFO frequency units to Hz (from unitless)
• Enhance LFO delay parameter resolution and units (seconds)
• Enhance global volume parameter resolution and units (dB)
• Enhance part volume parameter resolution and units (dB)
• Enhance sub synth volume parameter resolution and units (dB)
• Enhance sub synth volume velocity sensing resolution
• Fix zippering when changing master volume
• Fix misaligned points in live envelope values
• Fix possible crash when envelopes are provided invalid live data
• Fix minor bugs

Approved by: pi