AU Host: Implement reset() on hosted AudioUnit instances - #1735
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Fixes #1732.
AudioUnitPluginInstancenever overridesreset(), soAudioProcessor::reset()on a hosted AudioUnit is the base class's no-op and the plugin keeps whatever it was doing, where the VST3 host'sreset()deactivates and reactivates the instance. The override sendsAudioUnitReseton the global scope and then on every bus, the same callsreleaseResources()makes, guarded byprepared.Verified with a measurement host rendering a compressor's gain ladder fresh and again after two seconds at full scale and a
reset(): through AU the second ladder's first rungs no longer carry the first ladder's release, and match the VST3 build's.