OClCollMeshEngn,PcloudStimProd: Produce into intensity stimbuff

PcloudStimulusBuffer::produceFrameReq():
Now correctly produces into the stim frames for the
PcloudIntensityStimulusBuffer object that's attached to the
PcloudStimulusProducer. If there's no attached I stimbuff, then
the OpenCL kernel will simply not write out the intensity data.

This is the first moment when we actually use the SP-MC ringbuffer
properly and actually cycle through the frames, producing into
them one by one.

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.h

@@ -6,6 +6,7 @@
 #include <cstddef>
 #include <memory>
 #include <functional>
+#include <optional>
 #include <iostream>
 #include <stdexcept>
 #include <chrono>
@@ -48,6 +49,7 @@ public:
 		compactCollateAndMeshFrameReqCbFn;
 	void compactCollateAndMeshFrameReq(
 		AsynchronousLoop& asyncLoop, StimulusFrame& stimulusFrame,
+		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
 		Callback<compactCollateAndMeshFrameReqCbFn> callback);
 
 private:
@@ -60,10 +62,13 @@ private:
 		compactKernelCbFn callback);
 	bool startCollateKernel(
 		StagingBuffer& assemblyBuff, StagingBuffer& collationBuff,
+		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
 		collateKernelCbFn callback);
 
 	void compactKernelComplete(bool isFinalizing=false);
-	void collateKernelComplete(bool isFinalizing=false);
+	void collateKernelComplete(
+		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame,
+		bool isFinalizing=false);
 	bool stop();
 
 public:
@@ -131,7 +136,9 @@ private:
 	bool compileAndPrepareKernels();
 	bool setupSlotCompactorsArgs(
 		StagingBuffer& assemblyBuff, uint32_t nSucceeded);
-	bool setupCollateDgramsArgs(StagingBuffer& assemblyBuff);
+	bool setupCollateDgramsArgs(
+		StagingBuffer& assemblyBuff,
+		std::optional<std::reference_wrapper<StimulusFrame>> intensityStimFrame);
 
 	// Generic buffer mapping/unmapping for zero-copy synchronization
 	bool mapBuffer(