Implement new intrin params; fix parseSynonyms

Previously parseSynonyms didn't properly return the last provided
synonym of the param in question, so fix it here to do that.

stimBuffApis/livoxGen1/pcloudAmbienceStimulusBuffer.h

@@ -10,11 +10,23 @@
 #include <user/stimulusBuffer.h>
 #include <user/stagingBuffer.h>
 #include <user/deviceAttachmentSpec.h>
+#include <user/intrinThresholdParams.h>
 #include "lg1PcloudAmbienceStencil.h"
 
 namespace smo {
 namespace stim_buff {
 
+inline intrin::ParsedThresholdParam parsePostrinInterestParam(
+	const std::shared_ptr<device::DeviceAttachmentSpec>& deviceAttachmentSpec)
+{
+	return intrin::parseOptionalThresholdParam(
+		deviceAttachmentSpec->qualeIfaceApiParams,
+		intrin::kPosIntPcParamNames,
+		intrin::kPosIntThrParamNames,
+		90,
+		intrin::ThresholdUnit::Percentage);
+}
+
 // Forward declaration
 class StimulusProducer;
 
@@ -40,22 +52,18 @@ public:
 			callbacks, flags),
 	nStencils(nStencils_)
 	{
-		// Parse postrinInterestPercentage (interpreted as percentage 0-100)
-		const std::vector<std::string> postrinInterestThresholdParamNames = {
-			"postrin-interest-percentage",
-			"postrin-interest-pc",
-			"postrin-interest"
-		};
+		intrin::validateNoForbiddenUnitlessIntrinParams(
+			deviceAttachmentSpec->qualeIfaceApiParams);
 
-		postrinInterestPercentage = static_cast<uint32_t>(
-			device::DeviceAttachmentSpec::parseOptionalParamAsIntWithSynonyms(
-				deviceAttachmentSpec->qualeIfaceApiParams,
-				postrinInterestThresholdParamNames,
-				90));
+		const auto postrinInterestParam =
+			parsePostrinInterestParam(deviceAttachmentSpec);
+		postrinInterestPercentage =
+			postrinInterestParam.unit == intrin::ThresholdUnit::Percentage
+				? static_cast<uint32_t>(postrinInterestParam.value)
+				: 0U;
+		postrinInterestThreshold = intrin::resolveThresholdValue(
+			postrinInterestParam, nDgramsPerFrame_);
 
-		// Convert percentage to absolute frame count
-		postrinInterestThreshold = static_cast<uint32_t>(
-			(nDgramsPerFrame_ * postrinInterestPercentage) / 100);
 		// Parse ambienceIntensityLowVal from qualeIfaceApiParams
 		const std::vector<std::string> ambienceIntensityLowValParamNames = {
 			"ambience-intensity-low-val"