Submix hierarchy deallocation fixes

lib/audiodev/AudioSubmix.cpp

@@ -15,6 +15,10 @@ AudioSubmix::AudioSubmix(BaseAudioVoiceEngine& root, IAudioMix& parent, IAudioSu
 
 AudioSubmix::~AudioSubmix()
 {
+    while (m_activeVoices.size())
+        m_activeVoices.front()->unbindVoice();
+    while (m_activeSubmixes.size())
+        m_activeSubmixes.front()->unbindSubmix();
     unbindSubmix();
 }
 

lib/audiodev/AudioVoiceEngine.cpp

@@ -4,6 +4,14 @@
 namespace boo
 {
 
+BaseAudioVoiceEngine::~BaseAudioVoiceEngine()
+{
+    while (m_activeVoices.size())
+        m_activeVoices.front()->unbindVoice();
+    while (m_activeSubmixes.size())
+        m_activeSubmixes.front()->unbindSubmix();
+}
+
 void BaseAudioVoiceEngine::_pumpAndMixVoices(size_t frames, int16_t* dataOut)
 {
     memset(dataOut, 0, sizeof(int16_t) * frames * m_mixInfo.m_channelMap.m_channelCount);

lib/audiodev/AudioVoiceEngine.hpp

@@ -46,6 +46,7 @@ protected:
     void _unbindFrom(std::list<AudioSubmix*>::iterator it);
 
 public:
+    ~BaseAudioVoiceEngine();
     std::unique_ptr<IAudioVoice> allocateNewMonoVoice(double sampleRate,
                                                       IAudioVoiceCallback* cb,
                                                       bool dynamicPitch=false);