StimBuff: Make virtual so we can dynamic_cast in getOrCreateStimBuff

include/user/stimulusBuffer.h

@@ -39,7 +39,7 @@ public:
 		ringBufferConstraints)
 	{}
 
-	~StimulusBuffer() = default;
+	virtual ~StimulusBuffer() = default;
 
 	// Non-copyable, movable
 	StimulusBuffer(const StimulusBuffer&) = delete;