StagingBuff: support both Mlock & IOUring pin; Use in IoUAssmEngn

We use io_uring_register_buffers() for IoUringAssemblyEngine instead
of using mlock(). This __appears__ to have reduced CPU utilization on
the Dell laptop. Could also be that we recently upgraded total RAM
from 8GiB to 32GiB.

stimBuffApis/livoxGen1/pcloudIntensityStimulusBuffer.h

@@ -35,15 +35,15 @@ public:
 
 	~PcloudIntensityStimulusBuffer() = default;
 
-	// Non-copyable, movable
+	// Non-copyable, non-movable: inherited pinner lifetime is instance-bound
 	PcloudIntensityStimulusBuffer(
 		const PcloudIntensityStimulusBuffer&) = delete;
 	PcloudIntensityStimulusBuffer& operator=(
 		const PcloudIntensityStimulusBuffer&) = delete;
 	PcloudIntensityStimulusBuffer(
-		PcloudIntensityStimulusBuffer&&) = default;
+		PcloudIntensityStimulusBuffer&&) = delete;
 	PcloudIntensityStimulusBuffer& operator=(
-		PcloudIntensityStimulusBuffer&&) = default;
+		PcloudIntensityStimulusBuffer&&) = delete;
 };
 
 } // namespace stim_buff