livoxGen1: Add StimBuffs to PcloudStimProd

* PcloudStimulusProducer now has member sh_ptr<StimulusBuffer>s.
* StimulusProducer now has a vector<sh_ptr<StimulusBuffer>s.

Created new stimbuff-type-specific
Pcloud[Xyz|I|Ambience]StimulusBuffer classes for representing each
stim feature exposed by livoxGen1's PcloudStimulusProducer.

commonLibs/attachmentSupport/stimulusProducer.cpp

@@ -9,10 +9,26 @@
 #include <componentThread.h>
 #include <spinLock.h>
 #include <user/stimulusProducer.h>
+#include <user/stimulusBuffer.h>
 
 namespace smo {
 namespace stim_buff {
 
+std::shared_ptr<StimulusBuffer> StimulusProducer::getAttachedStimulusBuffer(
+	const std::shared_ptr<device::DeviceAttachmentSpec>& spec) const
+{
+	for (const auto& buffer : attachedStimulusBuffers)
+	{
+		if (buffer && buffer->deviceAttachmentSpec &&
+			*buffer->deviceAttachmentSpec == *spec)
+		{
+			return buffer;
+		}
+	}
+
+	return nullptr;
+}
+
 void StimulusProducer::stop()
 {
 	{